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A crack in the line would leak pressure and vent out of the tank vent. IIRC, he stated that fuel got to the LP but nuttin' out. COULD have a POS in the inlet of the pump. I have seen that before. A piece of debris in the fitting that is replaced when the pump is changed, unseen by the guy that...

Doesn't matter how "momentary" it was. The system isn't designed for 100 psi. There are two check valves in the lift pump, one in the inlet, the other in the outlet, they are identical, just installed opposite each other. You can remove the threaded outlet port, and look at the valve to see...