1996 Chevy K1500 V6 manual

GM likely used the oil pressure sending unit as an alternate way to energize the fuel pump at that time. So the fuel pump would stay operating even if you removed the fuel pump relay. It would start without the fuel pump relay if cranked long enough to build oil pressure too. So look in to that before running now wires or doing some other needless thing.

Havaing the fuel pump run all the time could cause damage to the engine if the fuel pressure regulator leaks or a fuel injector leaks and hydrolcks a cylinder with fuel.

Hey, very interesting information because yesterday, I was already searching for the best way to replace the relay socket base by searching for a single fuel pump and socket base, which I would rewire. Not a comfortable solution for me because these new relays I found so far are of different configurations, and I would need to figure out how to rewire the new one.

Could you please verify that the oil pressure sending unit and the Engine Oil Pressure Switch & Sender Unit are the same thing? If yes, I did replace it last March because the old one would not allow the truck to start. That does not mean that the current one is not misbehavingā€¦ It is an inexpensive unit, just a real pain to replace because you have very little space and need the special removal tool, but I prefer to do that than figure out a new fuel pump relay and socket replacement.

Thank you

Oil pressure switch is if thereā€™s an oil light.

Oil pressure sending unit is if thereā€™s an oil gauge.

Tester

Thank you Tester but I am not yet sure. The unit I replaced was called an Engine Oil Pressure Switch & Sender Unit. I guess the trick is the ā€œ& sender unitā€, which makes me think that the device I replaced last year was the oil pressure switch, which also includes the oil pressure sending unit. So I just want to confirm if I am correct or if the part mentioned by TheWonderful90s is a separate part.

Didnā€™t you check the oil pressure switch three weeks ago as instructed in your other thread?