How EVAP Systems Work - Automotive Education

In this video on Emission Systems, we are talking about the Evaporative Emissions System and how it functions.
The job of the EVAP System is to capture fuel vapors from the fuel tank and store them in a canister of Activated Charcoal until they are able to be burned in the engine. The video walks through the basic function and intent of the system that can trip up even seasoned Automotive Technicians.
Stay tuned for future videos when we walk through how to troubleshoot and diagnose these systems.

Пікірлер: 64

  • @l3luel3xus
    @l3luel3xus8 ай бұрын

    I just needed a diagram of how everything is plugged up. Hopefully I can plug everything up and get ready to bar my car soon. You have made things a lot more simpler. Thank you! You have yourself a new subscriber!

  • @leandrolefa
    @leandrolefa Жыл бұрын

    Very good, clear and thorough explanation.

  • @brandenchailler2427
    @brandenchailler24274 ай бұрын

    Heck yeah. Explained it better than the other two guys I saw so far. Nice.

  • @martinschulz9381
    @martinschulz9381 Жыл бұрын

    Well explained. I just had the evap purge solenoid replaced on my Chevy, just here to get some understanding of exactly what it is and what it does.

  • @charlesba2565
    @charlesba2565 Жыл бұрын

    thank you very much for taking time to shoot this tutorial. Much love!

  • @aadithiansankar1185
    @aadithiansankar1185Ай бұрын

    thank you for teaching, your explanation is good.

  • @DIYAutoHomeschool

    @DIYAutoHomeschool

    Ай бұрын

    Thank you! I'm glad you liked the video

  • @blackwater4793
    @blackwater4793 Жыл бұрын

    Super straight forward thank you for this

  • @chris02948
    @chris029484 жыл бұрын

    Very informative thank you!!

  • @larrybob3610
    @larrybob36103 жыл бұрын

    I'm learning more on KZread than my automotive class I'm currently attending. 😂😂💯

  • @okparasamson7984

    @okparasamson7984

    2 жыл бұрын

    Larry Bob Can i have your email address pls

  • @okparasamson7984

    @okparasamson7984

    2 жыл бұрын

    Really wanna get in touch with you.

  • @kylehubick6589

    @kylehubick6589

    2 жыл бұрын

    Came here from my auto class to actually understand how it works. THEN you can go learn the more intricate systems and THEN learn how to diagnose them.

  • @MexicanJohnny
    @MexicanJohnny Жыл бұрын

    Thank you . This is what I was looking for. 3hrs later when I asked Google. Again thanks

  • @carlospolanco7257
    @carlospolanco72574 жыл бұрын

    Great video, Thank you.

  • @kentmckinnon288
    @kentmckinnon288 Жыл бұрын

    Great explanation Thanks!

  • @michaelkillebrew3114
    @michaelkillebrew31145 ай бұрын

    This video is perfect, thankyou

  • @seshachary5580
    @seshachary5580 Жыл бұрын

    very educative,thank you

  • @matheusribeiro2739
    @matheusribeiro2739 Жыл бұрын

    That's brilliant. Thanks

  • @tysonstightlines3082
    @tysonstightlines30824 жыл бұрын

    Great video bud!

  • @connorporterfield3946
    @connorporterfield39463 жыл бұрын

    nice video quick and informative

  • @danielturner8502
    @danielturner850211 ай бұрын

    diagnosis video would be awesome right about now.

  • @danielcarroll5667
    @danielcarroll5667 Жыл бұрын

    Thank you !

  • @zaydnouaitti8219
    @zaydnouaitti82193 жыл бұрын

    The chamber purge valve on my Suzuki Swift got broken and I couldn't find a new/used one to install. The mechanics to whom I took it to all thought the purge valve was some "air component" and one of them replaced it with a small air filter, wich I know is wrong, but I'm keeping it on because otherwise the fumes make the car smell of gasoline. Is it possible to just delete the purge valve and have a direct connection to the charcoal canister?

  • @joselbazcom4221
    @joselbazcom4221 Жыл бұрын

    Thanks a lot for the information. Since what year were these systems implemented on cars? Do older cars from the classical era have to get these installed if they are used as regular transportation? My elderly 1973 Catalina wants to know. Maybe it already has it. Thank you.

  • @sarmadkhalel116
    @sarmadkhalel116 Жыл бұрын

    Dear, if you disconnect the evaporation hose from the antique, will the pcv valve still work normally? Or does it depend on the air suction from the antiques? My greetings

  • @sleeknub
    @sleeknub Жыл бұрын

    Did you ever do the followup videos about diagnosing EVAP system issues? I haven't been able to find them on your channel.

  • @michaelcourter5432

    @michaelcourter5432

    Жыл бұрын

    Same

  • @jasonfedelem
    @jasonfedelem2 жыл бұрын

    Can you post a link to the video on how to diagnose EVAP system problems? Currently trying to figure out are 2008 f250 5.4 L

  • @okparasamson7984
    @okparasamson79842 жыл бұрын

    Nice video

  • @chiranthasenadheera1956
    @chiranthasenadheera19562 жыл бұрын

    what if we remove the charcoal canister and purge valve directly connected with fuel tank???

  • @martinlang9615
    @martinlang9615 Жыл бұрын

    I understand this system now. Now I know the advice is not to trickle fill the tank as gas can flow directly into the charcoal canister which could cause it to malfunction. I get this…however, my big question is: IF I’m on a long road trip and know I have at least 100-200 klms left to go immediately after paying for fuel, in this circumstance, is it ok to trickle fill to the fuel neck if normally I would only fill to the first click (for shorter round town trips)? I figure if I straight after filling to the brim do at least 100 klms then the charcoal canister (if not defective) will correct itself.

  • @adriananzano2292

    @adriananzano2292

    7 ай бұрын

    no

  • @m.pietro9087
    @m.pietro9087 Жыл бұрын

    How can I asset up an EVAP system on a carburetor car?

  • @yoviss-vsz8851
    @yoviss-vsz88513 ай бұрын

    I have an issue with a dodge how can I know what to replace

  • @rjd72577
    @rjd72577 Жыл бұрын

    wonder if you would be interested in a re visit on this .. "what happens when fuel tank is over filled" as in when anyone tries to put that 1 more $1 in .. i know i have had to fix that ..

  • @trekbsg
    @trekbsg4 жыл бұрын

    How did pre-computer controlled(pre-1980's) vehicles control evap systems without the use of a pcm?

  • @michaeljvan6117

    @michaeljvan6117

    3 жыл бұрын

    They didn't have evap systems, just a vented tank

  • @trekbsg

    @trekbsg

    3 жыл бұрын

    @@michaeljvan6117 the vented tanks to the atmosphere were no longer allowed by the epa sometime in the late sixties into the very early seventies, my question was pertaining to the systems before computer controlled emissions and after the vented to the air systems.

  • @MrHaseeb24

    @MrHaseeb24

    3 жыл бұрын

    There was no purge valve, it was only charcoal canister. The vapours flow from the charcoal canister were almost uniform. The carburetor was tunned accordingly.

  • @bluevalkyrie2517

    @bluevalkyrie2517

    2 жыл бұрын

    Vacuum operated valve

  • @jordanimatedstreaming
    @jordanimatedstreaming8 ай бұрын

    2:04

  • @kacperchrusciel890
    @kacperchrusciel890 Жыл бұрын

    Another thing to cut out along with the egr pcv dpf and cat

  • @NirvanaBoy300
    @NirvanaBoy3004 жыл бұрын

    Would a bad charcoal canister cause spark knock?

  • @DIYAutoHomeschool

    @DIYAutoHomeschool

    4 жыл бұрын

    No, "Spark Knock" is a result of multiple flame-fronts colliding inside the combustion chamber. This would be caused by a second ignition source in the cylinder igniting the mixture in addition to the spark plug.

  • @NirvanaBoy300

    @NirvanaBoy300

    4 жыл бұрын

    DIY Auto Homeschool alright thanks I’m gonna replace all my spark plugs and see if it makes a difference. Love the videos man!

  • @DIYAutoHomeschool

    @DIYAutoHomeschool

    4 жыл бұрын

    @@NirvanaBoy300 What problem are you having and what kind of vehicle do you have? If you believe you're having Spark Knock, spark plugs are not usually the issue because true spark knock will happen when the plugs fire, but so does another ignition source in the chamber, causing the 2 opposing flame fronts to collide during combustion. Now, you can have spark knock, detonation or pre-ignition, and you kind of get to a point where these issues can overlap or be confused for one another. If your engine has a bunch of carbon deposits and buildup in the cylinders, they can act to basically increase the compression ratio of the cylinder, causing the pressure and temperature to rise above the fuel's ability to resist combustion just from heat alone (Octane Rating). That would be detonation or pre-ignition. That same carbon buildup can begin to heat up and the build up of excess heat on those points can reach a point that they will act as a secondary ignition source, creating that opposing flame-front that can cause spark knock.

  • @NirvanaBoy300

    @NirvanaBoy300

    4 жыл бұрын

    DIY Auto Homeschool I drive a 2001 Lexus ES300 with 165k miles. I hear a rattling type noise under load. What are some options I have to fix this?

  • @DIYAutoHomeschool

    @DIYAutoHomeschool

    4 жыл бұрын

    @@NirvanaBoy300 Before you do replace anything, just fill up your tank with premium fuel and drive for a bit. See if it changes. If you're not using 91 octane, you really need to be. If you don't have 91, you might skate by with 87.

  • @mrrobertwolfiii1079
    @mrrobertwolfiii1079 Жыл бұрын

    You got think like the vehicle does

  • @johnharrison5098
    @johnharrison50983 жыл бұрын

    so basically.....they jus added a second gas tank for fumes ......and with the addition of the vent valve on the canister,isnt that a bit redundant?

  • @lowellhalsteadjr4832

    @lowellhalsteadjr4832

    Жыл бұрын

    The vent is only open when the engine is drawing from the canister

  • @dustinbergeron7508
    @dustinbergeron75084 жыл бұрын

    I changed the vent valve the charcoal canister and the fuel cap and I still get the code p0455 I’m sick and tired of spending money on stuff that’s not the problem I spent over $300

  • @ilirhalili4712

    @ilirhalili4712

    Жыл бұрын

    Maybe the fuel cap is not closed proprely or there is a hole in the pipe.

  • @dustinbergeron7508

    @dustinbergeron7508

    Жыл бұрын

    @@ilirhalili4712 nope no hole and cap is properly on and closed tight

  • @ilirhalili4712

    @ilirhalili4712

    Жыл бұрын

    @@dustinbergeron7508 it’s the p0455 is “major leak detected” so probably from the fuel tank, you said you changed the valve but look if there is any hole in the canister. It’s plastic so it can be damaged easily.

  • @dustinbergeron7508

    @dustinbergeron7508

    Жыл бұрын

    @@ilirhalili4712 changed the purge valve, canister, pressure sensor, fuel cap, filler neck, and the vent valve

  • @ilirhalili4712

    @ilirhalili4712

    Жыл бұрын

    @@dustinbergeron7508 shiieet, well, last thing to do is to clear the code and hope for it to never show again. I had some problems with my sister’s Peugeot 208 with the adblue. The light turned on and I turned if off, then it came back and disappeared by it self. At that point, just drive with it if you can without any risk.

  • @fawzisdudah8511
    @fawzisdudah85114 ай бұрын

    I expected more.

  • @mrrobertwolfiii1079
    @mrrobertwolfiii1079 Жыл бұрын

    Home school pro

  • @stevenpeterson7234
    @stevenpeterson7234 Жыл бұрын

    So basically your engine gets ruined two different ways. The PCV valve and the evap system!! Awesome!! I'm deleting all of it tomorrow!!

  • @yoviss-vsz8851

    @yoviss-vsz8851

    3 ай бұрын

    How you deleting everything given me an idea

  • @ckle2685
    @ckle268511 ай бұрын

    Kyle - don't see that you comment much - hoping for some help. My Honda Fit is pulling a 2422 code - evap vent valve stuck closed. It's not - and it functions properly (when charged, closes and holds vacuum) - the ECM is delivering 12v to the valve - anticipate the ECM uses the ground to engage/disengage the valve. With ECM delivering 12v and a direct connect of the valve to the battery ground, the valve closes - so the valve is fully functional. Yet the code... The Fit's fuel tank has ALWAYS been a difficult full-fill - 10 gallons and on a full tank fill, the pressure shuts off the gas pump (back-pressure) at like 7-7.5 gallons. (that's about 100-120 miles of road travel). I know the valve is functioning - still pulls the 2422 code. Ideas?

  • @DIYAutoHomeschool

    @DIYAutoHomeschool

    11 ай бұрын

    Charcoal Canister is probably restricted. Seen a number of them full of water. That code will set if there is any restriction in the system, check the lines and the vent, but your issue is likely the Canister.