Not to create an argument but the only relation between the oil pressure switch and fuel pump is the oil pressure switch serves as a back up power supply to the fuel pump in case the fuel pump relay fails. It does not shut the fuel pump down, but can turn it on. The oil pressure switch can turn on the fuel pump once sufficient oil pressure is achieved ( approx 4 psi ).
If you have one of these trucks that has a intermittent or constant long crank to start, it might be due to the fuel pump relay or circuits. The long crank results from the time it takes to build up oil pressure and energize the FP circuit through the oil pressure switch.
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