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Tech, thanks for the reply but I have checked the tank pretty thoroughly and there are 3 lines for filling the tank. First the main fill line is a 1 1/4" fill pipe connected to the tank with a flex hose. I pulled the hose off and snaked the line both directions and it is clear. The vent line runs from the tank to the top of the gas filling line where the vapors from filling the tank is recaptured and sent back down the gas pump hose and returns to the filling station's gas tank for emissions control. This vent return line is also clear since I took it off and blew through it. The final line connecting to the top of the gas fill pipe is a larger line that connects to a pressure type of switch which I suspect is the one which results in the "check engine light" if the gas cap is loose. So in short I have checked all the fill lines into the tank and they seem all clear. Unless there is another line which I can't see on the top of the tank. But I'm pretty sure there is not another line since this would be an uncontrolled emission which would be illegal.
This weekend when the weather is nicer in new england, I will climb under the car again and be more thorough. Maybe I missed a line.
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