The problem is your oil pressure sending unit this sound hard to belive but its true and its the problem. The fuel system works on a split circuit from fuse # 9 power goe's to the relay but also goe's to the oil sending unit as well and the sending unit is the place where the fuel pump is feed from the relay comes into the oil pressure sending unit. A nd the oil pressure unit needs to build up enough pressure from the oil pressure for the switch in side of it ot trip your is hanging up. So the power supply to the fuel pump is being interuped because it is comeing from the oil sending unit.
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