Charles, by fuel pump module you mean the fuel pressure regulator or just the fuel pump itself? It would make sense that its returning to the tank because I can shut off the car for 30 seconds to a minute and you can hear the pump in the tank repriming the system, you can hear the air working its way out.
I was thinking the same about the fuel level, but I'm starting to rack my head on this one. You dont think its that stock line between the pump and the bulkhead do you? If there is a leak there that could do it.
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