Check engine light after filled up

[zam2000]

Twice in the last two weeks, after I filled up my gas tank, the engine light went on.

Both time, I retight the gas cap, and unplug the battery to reset the CE, and the check engine light went away (until the next fill up).

I think it's the gas cap, anyone experiences similar problem ????.

Again, for both time:

* The gas tank almost go empty before fill up
* Filled up (let it pump til stop).
* Light went on within 10 miles
* Retight the cap & unplug the battery, the light goes away.


Btw, my car is a 98 E320 (W210).

[Rafi]

This may not be related and I debated posting a reply, but here goes. My brother has a 2000 VW Jetta 30K mi with the exact same problem. He took it to VW dealer. They replaced the Mass Air Flow sensor cleaned the throttle body clened the injectors while on the car and the problem solved, total cost $600. Imagine a car with only 30K mi needing MAF sensor but it was not too expensive.

[blackmercedes]

Your fuel system is a sealed system, and that includes the gas gap. If the cap is left off, or the sealing gasket fails, it will set off the CE light.

New gas cap will probably solve the problem.

[Duke2.6]

You probably only need a new gasket for the fuel filler cap.

Duke