i got a de-lem-a...need a fuel flow check valve, so fuel cant be drained or sucked back down the fuel line(this is for my stepvan with a 6.5kw gen and its fuel pickup is teed into the main fuel line to the motor with a mechanical fuel pump)what happens is when i try to run the gen with out the van motor running, it will suck the fuel down from the van fuel pump and lose fuel to the gen. apperently the mechanical pump lets air back in the line if its not pumping.....dumb ?????