I know that if the gas cap is loose then the check engine light will come on. as far as the fuel gauge going up and down the "float" you have in your tank could be getting stuck. This is a pain in the rear to change because you will have to drop the fuel tank and either replace the part connected (best bet) to it or make sure the passage is clear.
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I have a 2001 Taurus The fuel gauge is erratic. I replaced the fuel tank module (fuel pump and fuel gauge sender) and also the fuel gauge and circuit board ( under fuel gauge). I still have the same problem. Can you help? Thanks! Rob
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