engine lights on 2004 Honda Accord

the engine lights goes on sometimes after I fill the car and understand the cap does not get on tight as they told me this when had it checked. I try to get it on tight but still comes on sometimes

by in Rock Hill, SC on April 25, 2009
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1 answer
ANSWER by , April 25, 2009
The gas cap has a "ratcheting" mechanism built into it. When you turn the cap to lock it you should hear a clicking sound. I tell people to turn it another 180 degrees after they hear the first click. Many auto repair shops have a "smoke machine". It is used to put a non flammable smoke into the gas tank to check for leaks. I wonder is the neck of the gas tank damaged that the cap seals on or is the cap its self defective?