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Glad you found the problem. As another mechanical fuel pump owner, I noticed your statement that the two little rubber valves were stuck. My question is why did that happen? In 2500 hours, that has never happened to me, and I use MMO in non-ethanol fuel. My opinion (I like to call it a theory, but others might call it a superstition) is that ethanol degrades the rubber in the valves and diaphragm of a mechanical pump, which makes the valves sticky. MMO keeps them lubricated. If you are not using MMO in your fuel, I recommend that you do, especially if you are using 10% ethanol.
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