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01 GMC Sierra 5.3 - No power to fuel pump after wonky oil pressure


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nsg3
New User

May 27, 2019, 1:21 PM

Post #1 of 4 (204 views)
01 GMC Sierra 5.3 - No power to fuel pump after wonky oil pressure Sign In

My Truck:
2001 GMC Sierra 1500 5.3 L V8250,000 miles, a lot, yes I knowOld shop truck


Little History:-Replaced the fuel pump about three months ago.
-About a month ago my Oil Pressure gauge starting fluctuating. Just back and forth slighting. Didn't drop to 0, didn't max out. Stay in about the middle just going back and forth a little. My dash lights are wonky as it is, the lights and stuff just don't work that great so I figured that was another symptom of that.
-About a week ago the truck started to stall out when it was idling.

Today:
-Came out of Home Depot and my truck won't start. It's stranded there now.

-When I turn the key over the fuel pump does not come on. Everything else is working fine, cranking and all, just no fuel.

-Not leaking oil.

-Fuel Pump relay is good.

I have read some articles that say when my Oil Pressure Sensor goes out it can cause the computer not to send power to the fuel pump because of a shared relay situation.
Most of them were saying to do things while truck was running... mine won't run. And, none of them mentioned the Oil Pressure Gauge acting funny before they had the problem.

Wondering if anybody has heard of this Oil Pressure Sensor and Fuel Pump connection.
My take was the relay for the Oil Pressure Sensor is used for a backup in case your fuel pump relay goes out. But, if you're sensor is reading 0 oil pressure it won't send power to the pump.

------I have not checked the power at the pump yet. I have to get back to the truck with some tools.Somebody trying to get me to replace the fuel pump again and I just don't think the pump is bad. Shouldn't be, it's new, haven't been running it low or anything of the sort.

------Has anybody experienced this or can somebody please help?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 28, 2019, 3:57 AM

Post #2 of 4 (151 views)
Re: 01 GMC Sierra 5.3 - No power to fuel pump after wonky oil pressure Sign In

No that is totally wrong. No fuel pump is dependant on the oil pressure sensor. That would be an extreme safety hazard. Besides, there is no oil pressure before the engine is started so it couldn't even run on a system like that.

You need to use a fuel pressure gauge to get an accurate pressure reading.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



nsg3
New User

May 29, 2019, 3:28 PM

Post #3 of 4 (128 views)
Re: 01 GMC Sierra 5.3 - No power to fuel pump after wonky oil pressure Sign In

Thanks for the reply.
I went back with some tools and I was getting power at the fuel pump. Since it's an old shop truck I cut me a door over my fuel pump the first time I replaced it. Still had a few months left on warranty. Pulled my flap back and pulled the old one out, claimed my warranty, and put the new pump in.

Started right up. Wondering if I just got lucky with a defective fuel pump or if something is causing the pumps to go bad.

The tank is clean, new filter, hoping I don't have any problems any time soon.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2019, 3:38 PM

Post #4 of 4 (123 views)
Re: 01 GMC Sierra 5.3 - No power to fuel pump after wonky oil pressure Sign In

They have a known problem with the plug that attaches to the pump. Most quality replacements come with a new plug.

The brand and quality of the parts has a lot to do with the failure rate along with any debris in the tank. Since the tank is likely plastic, rust likely isn't a concern.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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