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hey guy, well got a problem with my 1997 chevy lumina 3100 v6 118k miles the gas tank is doing a "thumping sound" like thump,thump,thump... and the service engine light is on. code P0440. no gas leaks or smells, car runs just fine, no noticable loss in mpg's. hell if i didnt live in a smog nazi state like ca....... i'd clear the code,say F it...but!!!! its NEVER failed to pass smog test. https://www.fixdapp.com/blog/p0440 i took a look under hood, no smells of gas all connections look good. this car has made this sound before, but never set a code its done it (the sound) before.(turn the key to start the car,fuel pump primes and i'd hear some sound other than the pump). oh yeah, new gas cap, actually i tried 3 different caps, 1,locking 2,one i had on the car 3 my spare cap....so i not think itsthe cap. thanks fellas, ya'll been a big help since i joined in 2006!