Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

flathead31coupe said

The pump is mounted in the back on the frame right? Where the it's straightens out after the wheel well opening. It comes out of the 3/8 sending unit. It goes over and down follows the frame rail down until it just straightens out to the pump

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Sounds to me like you’re asking your pump to pick up fuel through a factory sending unit with a 3/8 pickup and sock in the stock location with the pump mounted 4 feet in front of the tank. Imo that is a very less than ideal situation for that particular pump.