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f-series 1/2 have two fuel pumps on the single tank system. a low pressure sump pump is located in the tank, this is where your fuel sending unit is attached. its also the one that usually goes out. the second one is a high pressure, constant flow pump that sends pressurized fuel to the engine and sends excess fuel back to the fuel tank to maintain constant fuel fuel and pressure.
f-series 1/2 have two fuel pumps on the single tank system. a low pressure sump pump is located in the tank, this is where your fuel sending unit is attached. its also the one that usually goes out. the second one is a high pressure, constant flow pump that sends pressurized fuel to the engine and sends excess fuel back to the fuel tank to maintain constant fuel fuel and pressure.