Fuel Pump, 89 F250, 7.5
#3
If the pump is in good shape and being fairly new, it shouldn't take more than 2 or 3 seconds of pumping. If it takes 8 to 10 seconds that the seals are going weak, if it takes longer than that then the seals are just bad and sooner than later the pump will start running continuously to try and keep the fuel pumped up.
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