2004 22V No power to fuel pump

[longbeard]

I have a 2004 22v that has had an issue on and off where it would not start. When it does this, the fuel pump does not prime. So far I have changed the fuel pump it's self, and the fuel pump relays and fuses. I think that I have finally narrowed it down to the oil pressure sensor going bad and keeping the fuel pump from getting power. Has anyone else experienced this? Any thing else that could be keeping the fuel pump from getting power? And my next question is does anyone have a part number for the oil pressure sensor? I have looked the internet over, but nothing seems to be clear cut as the part that I am needing.

[KoolAid]

Mercruiser 315 MAG MPI?

[longbeard]

Sorry, yeah, guessing the engine would be helpful MAG MPI 350 Mercruiser

[tigemech]

it has a oil sender, and oil sensor correrct? One will have one wire going to it and the sensor will have a 2 wire plug in. unplug the sensor and jump the wires together. if it runs fine like that then replace the sensor.

[JCP]

If you don't have power to the pump at initial key on, doubtful that it is oil sensor/sender related. The pump comes on before you start cranking so you would not have oil pressure at that time.

[longbeard]

It has a three pronged wire, so not sure how to jump it. I had initially thought about doing that. I wouldn’t be so sure that the oil pressure sensor going out wouldn’t cause no power to the fuel pump, and honestly I don’t know what else it could be since I have replaced everything else I can think of. If you have other ideas of what it could be, I am open to suggestions.

[dj2]

Not sure about an 04 but my 08 has a flat "connector" with a cap on it right near the distributor. That cap has 3 fuses under it and I know that 1 or more of them go to the fuel pumps on my boat because that was the first thing my mechanic had me check for a fuel pressure issue.