dboyfrmfoez
Newbie
More than likey you have a three prong oil pressor sender switch/interrupter. When you are lower rpms your oil pressure sensor is interrupting your connection to the fuel pump which is then not allowing your pump to prime. This is a safety feature that works in numerous ways. One if the car were in an accident or if the oil pressure is too low from low oil it will interrupt the connection to the fuel pump and stall the engine. Also if the fuel pump relay goes bad while driving thr fuel pump will still be powered by the oil pressure sender.My buddy went through like 4 fuel pumps, I think the last time he put a new connector on the harness and it's been fine so far. You might try inspecting the harness for breaks and looseness. If your oil pressure switch only has one wire going to it, it's gauge only.
Which harness is that? The one for the fuel pump itself?
So if it only has the one wire, it means that the truck should cut off with the relay removed because the oil pressure switch will be doing nothing to counteract that, correct?
More than likey you have a three prong oil pressor sender switch/interrupter. When you are lower rpms your oil pressure sensor is interrupting your connection to the fuel pump which is then not allowing your pump to prime. This is a safety feature that works in numerous ways. One if the car were in an accident or if the oil pressure is too low from low oil it will interrupt the connection to the fuel pump and stall the engine. Also if the fuel pump relay goes bad while driving thr fuel pump will still be powered by the oil pressure sender.My buddy went through like 4 fuel pumps, I think the last time he put a new connector on the harness and it's been fine so far. You might try inspecting the harness for breaks and looseness. If your oil pressure switch only has one wire going to it, it's gauge only.
If your truck doesnt dies when you pull your fuel pump relay. Your oil pressure sensor switch for the gauge is bad...
Does your oil pressure guage go down as the motor stalls?
Does your truck not start after stall?
does your truck not register oil pressure while long cranking after stall?
If you want to rule out relay
Cut a 3 inch wire crimp the ends with the proper blades that can be inserted in prongs 30 and 87 for the fuel pump relay. You should hear the fuel pump. Start the truck. If oil pressure is registered on gauge break the connection by pulling your jumper wire. If the truck dies the oil pressure sender /gauge is bad. Relay is good if test does the same with relay.