You could try a very light check valve right at the tank connection. We had that problem on our Freedom, and for the life of us we never could find a leak. We came to the conclusion that the mechanical lift pump on the genset was not strong enough (not sure if the conclusion was correct, but the solution worked). So, we did two things. One is we installed an electric fuel pump that was wired to the glow plug switch, so when you held the glow plug switch in the pump fired and primed the system. The other is we installed a check valve right at the tank. Our tank was lower than the genset, and the run was about 4 feet from the tank to primary fuel filter, and then another 4 or 5 feet to the genset. As I mentioned, this cured our problem, and we never had a problem starting or running the genset after that. And we never did find a leak.
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