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can a bad evap canister affect gas mileage

19K views 6 replies 6 participants last post by  Grimsta 
#1 ·
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?
 
#3 ·
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 ·
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.
 
#6 ·
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.
 
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