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2001 volvo s40 gas tank not venting S40-V40

posted by  volvorecycle on  Mon Nov 4 12:02 CST 2013
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last visit: Mon Apr 7 09:43 CST 2014
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I have this s40 where when you start the car, you can hear a thumping noise coming from the gas tank. and it will continue for 20 sec after you shut it down. If you take the gas cap off, alot of pressure comes from the tank. I think the problem is with the wiring going to the diagnostic pump. If i disconnect the hose coming from the tank to the pump, I do not have the issue. I tried another known good pump and the same thing happens. So now the next step is to check the wiring. Just wondering if anyone has seen this before that can give me some tips.






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New 2001 volvo s40 gas tank not venting [S40-V40]
posted by  volvorecycle  on Mon Nov 4 12:02 CST 2013 >


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