I put another gas tank and fuel pump on my car and now the "check gas cap" keeps coming on. What could be the problem? I have tighten the cap with no change.
My car has 2000000 miles.
The reason the gas cap light comes on is due to the vapor emission system of the fuel tank see a large leak and turns on the light. You will need to have the fuel tank smoke tested to see if there is a leak in one of the seals when you changed out the tank parts. A seal may of been cut or out of place for fuel pump. Your should get a mechanic like one with YourMechanic come and check the tank for leaks.
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