Evap System Leak!! Cant find the problem
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Joined: Jun 2013
Posts: 2
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From: San Jose, CA
Evap System Leak!! Cant find the problem Hi I own a 1987 Chev. Monte Carlo SS with a 2004 Ls1 5.7 GTO Engine. This morning I had an app. with State Ref. in Livermore, CA. and I had to cancel because as soon as I jumped on the freeway my check engine light came on!! Stoped at a gas station to get a troble shoot and got (P0442) Evap System Leak. They ran a SMOKE Test and could not find the problem. The tech said everything seemed ok even gas cap was good and I just bought the cap a couple of months ago and had the gas tank refurbished. Check engine light had not come on for a while. It had come up before but I thought that by refurbishing the gas tank and buying a new gas cap fixed it because it had turned off on its own till today!!
A friend just had the same problem and it turned out the locking ring on the tank only had 1 tooth fully locked and no seal. Someone replaced the tank in a hurry and half assed it. If the evap is good and the lines checked out I'd chase them back toward the tank and then check the seal to make sure its good.
