can a bad evap canister affect gas mileage
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Thread: can a bad evap canister affect gas mileage

  1. #1
    G20 Senior Member
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    can a bad evap canister affect gas mileage

    jus asking because i know i have to get my evap canister replaced, my car also get poor gas mileage, i was just wondering if the evap canister could affect my mpg?

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  3. #2
    G20 Member
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    no evap canister neutralize vapor from gas tank

  4. #3
    G20 Guru
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    evap csystem is in place to attempt to keep gas fumes from entering the atmosphere. it sends excess fumes into the intake manifold to be burned in the engine. car will run/perform fine without it. it will not effect anything. only thing is you will get a hiss when you remove the gas cap.

  5. #4
    shenanigans gotboost44's Avatar
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    I always get a hiss when I open the gas tank. Does that mean my evap system is not working right??

  6. #5
    G20 Guru
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    that is what i was told by a mechanic. he was replacing the evap on a mustang when i asked him what exactly it did.

    so from what i have been told, i would say yes it is not working as it should.

  7. #6
    Still learning :D LilAznFishinDude's Avatar
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    Ehhhh... I dunno. I'm a noob at this, but I get the hiss every now and then when I fill up. I believe it's just pressure built up by the fuel pump. I've read some one else say this. If you let your car sit a while, you won't get the hiss when you pop the cap.

  8. #7
    G20 Guru
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    The gas cap hiss has nothing to do with the functionality of your EVAP system.

    And no, a bad canister wont affect your mileage by any drastic means. Maybe .5 to 1 mpg

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