Thank you so much for making this video. I am a first time efi boat motor owner, and after years of carburetors, I was scared by the vapor separator and high pressure fuel pump. Thanks to your video, I was able to disassemble, troubleshoot and reassemble my vapor separator with no drama. Thank you for taking the time to make these videos.

Sir that was an extremely helpful video. My 2016 40hp Mercury was exhibited the same issues and your video provided me with the confidence to remove and clear VST tank myself. Thank you very much.

Have the same VST type unit on my HPDI. Always wondered what was inside. I think you're the first person I've ever praised on youtube. Content, clarity & approach was outstanding.

@DangarMarine

7 жыл бұрын

Hi Simon, glad the video helped you find out what is going in there. Thanks for taking the time to comment. :)

Great explanation. Appreciate you buying the parts to repair low pressure pump instead of just buying a whole new pump. Not always that common these days

This was by far the best video i have found on this! Thanks for your time and effort!

Thanks Stu.. I started digging for fixes for my Merc today, and found one of your old videos. I watch your channel anyway. Fun to come back to one of these older videos for a fix. It is my low pressure pump OR the grey fuel hoses......

Just starting to work on my Mercury 60hp efi outboard motor and your videos are a lot of help. Great detailed explanation and step by step instructions. Cheers!

Dangar Stu, ive watched a ton of your videos over the past year. Wanting to give you big applause for really knowing your stuff buddy. You rock! Of course I just smoked a high pressure merc efi pump and this was a big help seeing you service the vst on this motor. Many thanks!!

@DangarMarine

6 жыл бұрын

Thanks mate, glad you like the vids. Sorry to hear about your EFI pump...

Thank You for taking the mystery out of this fuel system, I did not know what was going on with it. Thanks Friend

I know this video is 4 years old but it helped me take apart the VST and clean out the needle valve that was causing fuel to leak out of my motor!! Great video!

My 2004 Mercury 60 EFI 4 stroke was left on the river too long without running (that was on me). Wouldn't run but for a few seconds when it did catch. I changed the fuel out (which looked pretty bad even though I had used stabilizer) and then began tracing the fuel...found it made it through the low pressure fuel gauge. Flushed out the lines by leaving the line open and pumping into a jar. No success. That's when I got online and learned about the VST (didn't know it existed). Because the motor had run well last year and it would start and run for a few seconds...I figured the VST had to be the culprit. Searched Amazon and found a replacement pump with "gasket" (keep reading) that worked for up to 60hp EFI Mercs. Ordered it and tore down the VST based on this video (watched several, but this was the most informative). I was surprised not to find a lot of gunk - just bits - so figured it had to be the pump (good I bought the replacement). Cleaned everything up using carb cleaner. But when I went to reassemble - the replacement pump did not fit correctly (I had to force it into the top rubber seal, and it would not seat in the VST. Bummer. Note, the new pump appeared to be the same length, but the nipple was too wide, and the bottom just would not seat (BTW - my VST had an old style gasket, not a rubber gasket/seal). So, I searched the model # on the old pump and found it was a Walbro F50000104 (keep reading), so I figured I needed to order the part. Watched the video again paying particular interest in his discussion of the pump...could be seized from setting up? As I figured the pump was bad, I took it to bench to test it (just need 12 V) - nothing. But then I did what he suggested and reversed voltage back and forth - still nothing - but after doing that about 5 or 6 times, it sprung back to life. AWESOME. Reinstalled the pump back in the VST and the VST back in the boat. Didn't immediately start, but after pumping the bulb up a while, the pressure came back and voila - she started. Took her for a spin on the river....and now she's back working like a charm. Kudos and a HUGE THANK YOU to people like Dangar who take the time to help the rest of us! BIG THUMBS UP!

Your videos have saved my hundreds in repair cost. I lost the vst drain screw and having problems finding a replacement. but I also have the problem of losing fuel pressure, but only at startup. I replace the primer bulb, but I still have to prime it every morning. Even when fishing, if I stop for an hour trolling, I still have to pump.

Absolutely some of the best web content anywhere!

@DangarMarine

3 жыл бұрын

Thanks mate. :)

Awesome Video! I looked and watched several videos. This was exactly what I needed. We really like our Mercury 50hp EFI but had a similar issue as this motor. Watched the video and dove in. Thanks for the explanation and clear suggestions. I also replaced the Idle Air Control Valve(Solenoid). Thanks saved a bunch of time and money. I subscribed and will watch others.

Great job...I didn't know what a VST was or what it did until this video.

@DangarMarine

3 жыл бұрын

Glad I could help!

I just subscribed to your channel and find your videos extremely interesting and informative. I run a 115 hp Yamaha 4 stroke on my boat. I'm learning a lot from you. Thank you for sharing your knowledge.

@DangarMarine

7 жыл бұрын

Thanks Martin, great to hear the channel has been helping you. :)

This video is very well done. I have had two mechanics look at my motor and neither wanted to get into the VST. This video will give me confidence to try doing this myself. I need to find a fuel pressure gauge someplace, but think I can handle the rest of the tools. Thanks!

@DangarMarine

7 жыл бұрын

Thanks Steve. Those gauges are pretty common on eBay.

Brilliant video, so well explained. I drained mine and it looked fine. Pulled the VST apart and the dirt etc was amazing. I highly recommend draining it regularly. I replace the pump and cleaned out the cooler at the same time. I always flush the motor after each use, but the small feeds to the heat exchanger and VST had become blocked and corroded. I will disconnect them and flush them separately from now on. Finishing with a blow through with compressed air. Its a Suzuki DF70 motor, but similar to your demo.

You do an awesome job very detail and clear to understand

This is an excellent breakdown of the vst. Thanks so much!

@DangarMarine

4 жыл бұрын

Very welcome!

Great video Stu. I don't have a four stroke motor, but still enjoyed watching and learning!

@DangarMarine

7 жыл бұрын

Thanks mate, you never know when you are going to need a piece of knowledge! :)

This is the best video I have seen. Very detailed and educational.thank you sir

@DangarMarine

Жыл бұрын

Glad it was helpful!

Your video simplified the repair on my recently purchased used 25hp Merc EFI VST. The HP pump case was rusting , hence rust clogging the HP pump screen. Ordered a new HP pump today. The last owner must have used ethanol fuel for the pump to be so corroded. Subscribed and liked.Thanks.

Great video as always! Greetings from Uruguay

@DangarMarine

7 жыл бұрын

Thank you!

Thanks for the post. Brilliant work.

@DangarMarine

2 жыл бұрын

Glad you enjoyed it

I have seen another video on VST and yours is very good!

@DangarMarine

4 жыл бұрын

Thanks mate!

Thanks Stu, just what I needed!

@DangarMarine

3 жыл бұрын

Glad to help!

Had the same problem, so took the VST apart on my 2006 -60hp Merc ( nice video - very easy to follow ), every thing was pretty clean, however when I pulled off the high pressure pump, the little black oval shaped rubber filter " housing" was missing the fine mesh screen on mine. Going to look at the low pressure pump next.

@jackmonigatti211

5 жыл бұрын

Hey mate, I’m having issues. Originally the motor would slowly stall from being on full revs. I gave it a service, and cleaned out the VST, however the motor won’t even start now. As the fella said in the video, it may be low pressure pump, so I’ll look at it next. How did yours turn out? Mines same model as yours

You are my hero, dude!!! You just help me save my buddy's boating season from the crap situation of his boat sitting in some overpriced mechanic's yard for months on end! We had gas blowing out the overflow. I'm pretty sure it was a gummed up regulator screen and/or a stuck needle. I used Seafoam Deep Creep and carb cleaner and reassembled (thanks to your exquisite direction). She runs like a dream again and no overflow problems!!! Thanks again Stu!! ~2015 Merc 60hp OB EFI

@DangarMarine

4 жыл бұрын

Good news, glad to hear its up and running again. :)

Hi thank you very much for the video I have a similar problem with my Mercruiser 60hp efi. Now I will check all from this very informative video.

@dallinklein1396

3 жыл бұрын

What was your problem and what was your fix?

@jonhall7897

3 жыл бұрын

@@dallinklein1396 fuel supply line internally collapsed.

Man you just save me some money, Thanks for the video, I found a lot of corrosion in my VST and it was running like crap if at all. No telling what the shop would of charged me.

@DangarMarine

7 жыл бұрын

You're welcome David, glad you found the problem. :)

This is an excellent video ! Well this may get a little lengthly but may be worth the read if you have a Mercury 60 Hp four stroke EFI. I bought a 2013 boat with probably 25 hrs on the engine. Took it out once and cut it off and had problem starting it. Going fishing this year and it would not start. Called several shops and long lead times and none would provide appointment therefore, started searching you tube. First changed fuel out then fuel filter. I then went to low pressure fuel pump and removed the tube and turned engine over. Pump had flow so i then went to vapor separator tank and drained with the brass drain screw. Still would not run. So I then pulled the separator using this video and disassembled. I found two issues first the high pressure pump had no screen on plastic end and i discovered the fastener end of an orange tywrap inside the tank.. There was a strange substance probably the remaining portion lodged at the end of the high pressure pump. This separator had never been removes because it had the factory clamps on all the fuel lines. Cleaned everything including the fuel regulator and reassembled. Pumped the bulb and hit the start switch and started immediately. Hopes this helps anyone with starting issues

That's for posting. The previous owner took all that of my engine and rugged in a external regulator. I bought all the right stuff but had no idea where all the hoses went to.

@shawnkeenan2576

2 жыл бұрын

Would love to see a pic of this setup. Thought about doing this myself. Thanks

@toneystevens5023

2 жыл бұрын

@@shawnkeenan2576 Don't. Pit it back stock.

Great info and vid as usual.....thank-you for sharing.

@DangarMarine

7 жыл бұрын

Thanks John, you're welcome. :)

Great video. You just saved me over a thousand dollars. Thank you!!!

another great video, you deserve more subs

@DangarMarine

7 жыл бұрын

Thanks Tony!

Very clear and helpful. Thank you

You were so helpful thank you.... you save me lots of money mercury wanted 1000 dollars... I got it done for 40$

@DangarMarine

3 жыл бұрын

Fantastic!

Thank you very much. Great help. And it's funny at 1:32 when you realize the part actually looks like an outboard minus the prop :)

Excellent video thanks

The culprit, it seems, was the float needle. Thanks for in excellent vid.

exellent clear and helpful vidio

Hey Dangar, Yeah i just wanted to say hey :) loving the vids especially the evinrude 150

@DangarMarine

7 жыл бұрын

Thanks Ryan, hopefully that Evinrude will be going back on the boat today. Video of that on the weekend.

Outstanding sir. Thank you.

@DangarMarine

2 жыл бұрын

Very welcome

Great video

Always great vids from Dangar. 👍

@DangarMarine

5 жыл бұрын

Thanks Michael!

Thankyou for this video. I have a 25efi merc. It's been dying when put in gear and also when I let off from a stretch of full throttle. Motor has sat most of its life. I'll drain it and see if it helps. If not I'll tear it apart.

Another good reason to have a water separator. I can imagine the problems you have if the vst gets full of water.

@DangarMarine

7 жыл бұрын

Yeah, a water separator is a lot cheaper than a new high pressure pump, that's for sure!

Awesome video! This actually got a boat running that I purchased from a friend. The motor is a mercury 60 efi. My problem was indeed that screen above the fuel pressure regulator inside the vst. It was completely clogged. Hey, did you ever make a video on removing the lower cowling on the motor that is in this video? I'm having a problem finding it. I of course did subscribe to your channel and have watched many of your informative videos! Awesome stuff! Thank you

Nice job, I have a2011 mercury 150 pro xs optimax and one of the fuel rails is hotter than the other. It doesn't won't to stay running

Awesome content brother. Thanks for all the information. What’s in the spray can with the red lid?

Thanks for this, mine is 60hp 2005 efi, been sitting little over 2 years plugs firing but want start hope this does the trick

@stevemiller1037

5 жыл бұрын

Ronald Howell hey bro did this work or did you need a new one? Mine won’t start either gives no fuel

@ronaldhowell4146

5 жыл бұрын

It worked and got mine running, old one was in bad shape, it went dead few times but it might still have some bad gas in the lines, it's been sitting up 2 or 3 years, I'm trying to work the kinks out.

Nice job Stu. We see issues with VST's as well here due to ethanol fuel..

@DangarMarine

7 жыл бұрын

Hey Will. Does the Ethanol fuel leave water traces or cause other problems with them?

Interesting, as usual.

@DangarMarine

7 жыл бұрын

Thanks Louis.

I love your videos! You have the best marine repair channel that I have ever seen. Can you tell be about your solvent sprayer? I get one like it. Thanks, and keep the awesome videos coming.

@DangarMarine

7 жыл бұрын

Thanks Dan. That sprayer is from Wurth. www.ebay.com.au/itm/Wurth-Pump-Spray-Bottle-1L-suits-brake-cleaner-solvents-degreaser-tyre-shine-/151021962172

Awesome video! Just out of curiosity, how did you get to that bottom or lower 8mm bolt to remove the vst? What did you use?

Great video. Judging from the amount of HP fuel pumps being sold on ebay, I gather they are the major cause engine starting problems. I suspect my issue IS the HP fuel pump as I have inspected the low pressure fuel pump and it appears fine. If I squeeze the fuel bulb my engine still dies. Which is the opposite to your video. I did remove the HP fuel pump and applied 12VDC and the pump made a squealing noise and seized up. Just waiting for my aftermarket fuel pump to arrive.

@DangarMarine

7 жыл бұрын

Definitely sounds like your onto the problem. Hopefully the part will arrive quickly!

Nice mate..

@DangarMarine

7 жыл бұрын

Thank you! :)

Thanks!

@DangarMarine

2 жыл бұрын

You're welcome David and tanks for your support! :)

AWesome video! What did you spray the VST with to clean it out? Is that some type of carb cleaner?

Great Vidio thank you very helpful

Hi, am enjoying all your videos! Thank you! my outboard has automatic oil injection and as I was changing that oil to prep for the season, I spilled on my concrete floor and made a mess! Any tips to clean up mess? Thanks

@DangarMarine

7 жыл бұрын

You can get a degreaser from any auto stone that will help get that off. Let it soak from a bit then scrub it with a stiff bristled brush. Pressure washers do a great job of the final cleanup if you have access to one.

Great vid! Ive never owned or have much knowledge on the newer 4 strokes..but it seems as if that is todays version of a carb cleaning (the vst). Are the injectors easy to access and clean on these motors?

@DangarMarine

7 жыл бұрын

Yeah, the injectors are nice and easy to get to on this motor and most outboards. Unlike the Subaru ones I have to clean this week...

I really enjoyed the video! Where can I get ones of those pressure gauges? Is there a particular size for the Schrader valve? Thanks

So glad I found this video. Excellent information on servicing/cleaning the VST. I have been having issues with my Mercury Bigfoot which has the identical VST from what I can tell. My boat issue is it will not go over 4000 rpms for the most part but very rare it will start going the 5200 rpms it was going before for about a minute then go back to the 4000 rpms. I had opened up the VST before seeing this video and cleaned the VST with carb cleaner but did not tear it apart like you did. I did notice the VST strainer at the bottom had torn but did not see much debris and put it back on as is. Did not think the strainer would cause the low fuel pressure. Could you give me some ideas of what I might check with this issue? Should I tear apart the vst and look at the parts again as you have shown in video? Thanks for any help!

@DangarMarine

6 жыл бұрын

I would put a fuel pressure gauge on it first. If you are getting a good constant 40PSI of fuel pressure then it can't be your problem. If it does fluctuate / drop then yes, I would pull it apart and go all the filters.

Excellent job!!! Hoping this is what's wrong with my Mercury 4 stroke bigfoot 60. I was told to flush VST, clean pressure regulator and a bottle of quickleen in fuel.

@bhamfire22

6 жыл бұрын

The boat hasn't been started in 3 years up until this past summer. It's a friend's boat. I was told if I could get it running I could have it they don't have time anymore for it. 3 years ago it ran great and just had new injectors and plugs. But now when at full throttle it will not run at max rpm or speed. Every so often it will but once throttled down and back up it stops. Got a new fuel filter I'm going to instal along with cleaning vst

@DangarMarine

6 жыл бұрын

Cleaning out the fuel system is a great start, particularly if it has been sitting for a long time. I would also throw some new spark plugs in it etc Treat the start up like a major service.

great video i think i have the same set up on my yam 115 efi so i will clean the vst out on it as i did have a problem with water in the fuel last year but i didnt drain the vst just changed the fiters

@DangarMarine

7 жыл бұрын

Yes, this is a common setup on all modern EFI outboards. If you had water in the fuel I would definitely drain the VST.

@lefty940

7 жыл бұрын

Thanks Stu i will do that

@lefty940

7 жыл бұрын

Hi Stu i took your advice and cleaned my vst (tricky job on the yam 115 had to remove inlet manifold to get at the vst). Glad i did it the filter on the bottom of the pump was very dirty so i went the full hog and cleaned the fuel rail cleaned the injectors and put new filters in the injectors too. What a difference it has made the boat is going faster than it ever did before got loads more power now thanks to your videos

Brilliant video. I have a 06 25 HP merc/tohatsu that needed the vst cleaned after the factory gray fuel line disentegrated inside and plugged the vst strainer. Also a 12 merc 60 efi just like the one in the video that would start bigging down on plane and not go over 4000 rpm. Sometimes stalled and restarted immediately with a hard primer bulb. I took the vst apart first and found hard black sediment on the vst screen that I cleaned and solved the problem. Looked like black rust but not magnetic. I bought the biat used from a buddy that used e10 furl and didnt use the biat a lot. When i bought it i drained the fuel from the onboard 26 gallon tank and have only ran rec 90 ever since. Im perplexed as to what the sediment is as tgere is no evident corrosion in the vst and the liner of the fuel lines look good. I was thinking maybe the in tank section of hise on the regulator? Have you ever seen debris like this on a vst screen? Thanks forbthe great videos!

Hello! Thanks for the very informative video btw. I would just like to ask on how I can custom make a gasket for the VST since parts are very difficult in our area. It has already been deformed and would not seal completely. Thanks

Just curious if you made the video for the lower cowling removal?

Very helpful, I would have a new rubber gasket on hand before you take this apart.

Great vid! Before I tear into this job on my 2003 40hp Merc EFI 3-cyl (which I should probably do anyways), I was hoping you could help with a quick question: If my upper fuel filter always empties when I'm giving it throttle, would you be more likely to suspect the low fuel pressure pump, high fuel pressure pump, or air getting into the lines before that upper filter?

hey mate quick question , when refiitting will the low pressure pump fill the tank up enough on its own giving the high pressure pump wont have anything to pump as its been drained? i have an 02 50hp efi that has been a bugger and had found that the low pressure pump had not been doing its job i wish i had of seen your videos a long time ago haha very helpful thanks.

This is an excellent video and gives me the confidence to tackle this job. I have the same engine and it's leaking fuel from the overflow tube. I can only assume that there's a problem with either the needle valve or the float in the VST.

@1991kelo

4 жыл бұрын

Bill Jimmis hey did this fix your problem. Mine is doing the same thing? Thanks Chris

@angelf200

4 жыл бұрын

@@1991kelo Mine too!! Did it help?

Great vid as always, have a 40hp efi that will not start ,been sitting for a while and was about to remove the VST when I searched for this vid. However the lower bolt looks hard to remove. Did you remove the lower cowling to get to the bolt? Cheers

@daleedmunds

6 ай бұрын

The lower bolt does not need to be removed, the VST housing has a slotted lug that slips over a rubber bushing.

Great video. Just can’t find an answer as to why the pressure would stay so low at only 15psi (high press shradder pin).... Time to replace the pump?

Hi Dangar, Thank you for your helpful and professional videos. I would greatly appreciate if you had a minute to advise regarding the following: I run a 30EFI Stroke Mariner that is starting with the second try at 90% comparing with the first try 10% . I have put new spark plugs, clean fuel filter but the problem remains the last 3 years i own this. Could this issue occur from the VST or something else? I don't experience any other issue when running the motor.

@DangarMarine

5 жыл бұрын

It could well be. An EFI motor should start pretty reliably so if the compression is good and it is getting a good spark then it is likely to be something with the fuel system. Could also be a leaking injector that loses pressure while it is sitting from fuel leaking into the cylinder. You could try an injector cleaner additive.

Stu, I am having a vaopr lock issue with my 1987 50 hp Evinrude. Is there a way to add a vapor separtor, perhaps an inline filter with a separator? Thank you!

Hi friend great video like always. I have a quick question about my Mercury 40hp EFI I am greeting a fuel pressure reading of 90 psi when it should be around 44 psi any thoughts on that and also it’s making my plugs black like it’s getting to much fuel. Thanks for any help.

@DangarMarine

4 жыл бұрын

Could be a bad pressure regulator.

Hi excellent video. have you any thoughts or experience with hydrofoil fins for out boards.are they worth the money. I was thinking of one for my 40 2 stroke yamaha. cheers. Al.

@DangarMarine

7 жыл бұрын

Hi Alan. Hydrofoil fins can have an amazing affect on some boats. They can solve problems with hull rolling, cavitation, trouble getting on the plane etc. I really must do a video on them very soon.

@albazar

7 жыл бұрын

brilliant,many thanks for the reply.

Hey Dangar love the videos. I had a question about my boat I was hoping you could answer. I have 1992 Mariner Magnum 3 ourboard and the problem is after running for a while or a long run I have to crank much longer than when cold. When cold it will start within 3 seconds of crank but when warm i may have to crank it for 10 seconds four or five times.

@DangarMarine

7 жыл бұрын

Sounds like it is running a bit rich. If you take a plug out and it looks very black I would confirm that the choke is coming off completely and then adjust the mixture screws to make it a bit leaner.

I have a question for you Stu; Are you aware if these Mercu-hatsu's have constant 12v to the EFI/HP fuel pump or if the ECU ramps the pump speed up and down depending upon demand? I have a recurring issue with an ECU on a 30hp EFI. Trying to decide if I purchase ECU #3 or if I find an ignition circuit to power the pump and move on... I realize there is a pressure regulator at the top of the VST and my assumption is that the pump must run full on and rely on the regulator to meter the pressure to the fuel rail.

Wonderful video - thank you! The issue you explain is very timely to my situationI. My new to me 2018 Mercury 40 hp 4 stroke EFI recently experienced fuel starvation issues. This came after running the boat over five hours and all was well. This was my third trip out since purchasing the boat. About a half mile from the launch ramp, the engine began sputtering and stopped. I immediately remembered I had not opened the small air vent on top of the fuel tank cap. The 6 gal. plastic tank sides were severely imploded and when the vent cap was opened, the tank regained its shape. I mention this because now the engine will only run a brief time after fully priming with the fuel bulb. I replaced the fuel filter and the fuel lines from the tank to the engine, but this did not help. Would I be correct the closed vent cap placed enough strain on the fuel pump to make it fail? Any guidance will be greatly appreciated. Thanks again for your video. Just subscribed!

@DangarMarine

2 жыл бұрын

I can't say I've heard of it damaging the low pressure pump, but it is possible. If priming with the bulb makes it run for a while it does sound like a pump problem.

Great explanation. I had no idea there was so much going on in a VST. I drained mine for winter on a 2017 Yamaha F70 and had to do a lot of cranking in the spring to get it started. Once it started, it ran fine. Any tips for getting it to start better after draining? BTW, I use ONLY ethanol free fuel.

@DangarMarine

6 жыл бұрын

You should be able to use the primer bulb to fill the VST. Sometimes you need to open a fuel line after the VST to let the air out though.

Opened mine up today,exact same one but my pump was corroded from sitting few years,

Great video. I’ve replaced my low pressure pump now the vst is pumping fuel out of the overflow tube at the top, inside back tube that goes over the vst and back down by the starter then out of the cowling through a tip into the water. Not good! I can’t figure out why it’s doing this. Any ideas?

I think my fuel pump is giving me problems as well. I took it apart same as you did. When I hook direct power to the positive and negative posts on the pump it doesn’t do anything. Motor has been sitting for 5 years. I have it soaking in solution hopefully it is just gummed up

On my 2003 Mercury 40 hp efi the fuel pressure regulator is on the outside of the vst. Is there supposed to be a hose hooked to the outlet pipe on this fpr? There's nothing attached to the small pipe coming out. I was under the impression there should be vacuum applied to it. Thanks for the video.

Thanks, another great video! I left my ign switch on for an extended period of time while storing my Tohatsu 25b, ran the battery dead. Does the High Pressure fuel pump run constantly if the key is in the "on" or run position (burning it motor is High pressure pump computer controlled? Did I damage it?

@DangarMarine

4 жыл бұрын

It will only run until about 40PSI is reached.

@amjimc

4 жыл бұрын

@@DangarMarine Thanks, I disassembled the VST as video explained and my pump was not rotating 12v applied. I used a little penetrating oil and used a pin to rotate pump through a small opening and then applied alternating + and -. it cleaned right up, started instantly, Thanks again

Hey bud, working on my 07 40hp merc vst. Should i be able to blow through the fuel pressure regulator?

@TheFreddy199

3 жыл бұрын

did you get an answer for this?

What does the hose coming off of the high pressure regulator on the vst go to? Pls help Dangar stu 🙏. I have a empty fitting on the bottom of the vst tank but didn't know if thats what it hooks to or not.

If you ever come across a Yamaha F115 that needs a vst service could you please make a video of that? Much appreciated, love your channel

@DangarMarine

5 жыл бұрын

Will do!

I have a 2019 Tohatsu MFS40. The motor idles fine an runs WOT fine. However, I began to smell gas and then saw the film of fuel on the water. Upon inspection, it is coming from the top of the VST. It's a pretty good stream. Would that sound like a stuck float/needle forcing too much fuel into the VST?

Oi amigo! 😁👍 Normalmente Quantos bar de pressão nessa bomba injetora? Hi friend! ask me a question please! normally How many bar pressure on this injection pump?

Do you have a video on the VST for a 115 Evinrude? I need to find out how it works badly. Appreciate your videos. Thanks!

@DangarMarine

5 жыл бұрын

No I don't, sorry.

Awesome video my 2009 200 fourstroke Yamaha runs fine for 1-2hr turning on and off a number of times and then displays fuel starvation.

@DangarMarine

6 жыл бұрын

We'll worth looking into the VST, and both high and low pressure pumps. Also look at things like the vent on the fuel tank,

thanks dangar handy info again..what symptoms does one look for in performance regarding pressure loss?.

@DangarMarine

7 жыл бұрын

If you start to lose fuel pressure it will pretty much stall or not start at all. I guess there could be some bad running / low power, but generally once the fuel pressure isn't there EFI stops working.

@truthbetold2012

7 жыл бұрын

good to know I have merc efi 60 ...this is handy info thanks again:)

The tube where the float needle enters... Can you blow air thru that tube or does it have some sort of filter in the 90 of that brass looking piece?

Need help with a 2015 Evinrude etec 25hp. Pulled high pressure pump out of vst and pulled wires off and I see a little piece of metal with a kind of diode made into it and it is connecting to both terminals on top of fuel pump. Any idea why that’s there?

I have a 2009 30hp 4 stroke merc ... do you find they are underpowered ??