kendunn,
This problem does happen from time to time, and as I see it it relates to various fuels and their effect on swelling the rubber cap gasket. It has happend to me in an enduro, and also Fred Hoess when he was on GG talking to his mech. Remove the rubber gasket, and enlarge the pin holes or punch the center out completely. Now remove the plastic part with the three vent holes that retains the ball bearing check valve. Enlarge these slightly as well. Reassemble and all should be good. If the rubber gasket is swollen to the point of being distorted, replace the cap, but modify before use.
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