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Put a manual fuel pressure gauge on the system. Get it started, let it run till you get consistent fuel pressure, then shut it off and see if the system bleeds pressure off. The fuel pump check valve in that system shouldn't leak off any more than 10 psi within 10 minutes. If it bleeds off that much in 10 minutes, then you have a bad check valve in the fuel pump, meaning the system is losing it's prime every time it sits. Therefore that pump has to work like crazy to get fuel to your plenum before it will fire.
Just one possibility.
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