After all the yrs visiting this board I can't recall anyone haven't this issue and the filter was the problem. Run these tests:
http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#FuelPumpandFIRelayDiagnosticTests
When you say fails to start sometimes, how often? Hot/cold engine? Some RSR are located around the coolant expansion tank. There two relays, one controls the electric fan. They are interchangable. Since you repaired the fuel pump relay once, I would look that direction.
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Post Back. That's whats makes this forum work.
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