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Well, sort of - when my fuel pressure gauge was working and I attached to the schrader on the fuel rail I observed that the leak down rate was very very slow (this was not during a no start period mind you). It was holding 20 or 30 psi for 30 or 40 minutes so I believe the check valve is good. Also the main fuel pump is only about 2 years old. Now could the check valve go intermittent? Doesn't seem plausable. I do like your idea of cleaning every single electrical connection on the car related to starting and running which I will put on the list for this weekend. The labor in that seems like chump change compared to what I've already put into this over the last several months...
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