Which oil pump to use

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iamdub

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Ok. I pulled the sensor and it looks clean. Of course that dont me squat.
I placed my finger in the hole and had my wife start it up for 2 seconds. It had enough pressure to blow oil past my finger.
So I have a replacement sensor on order, but I also want to test out the wires.
Does anyone have a diagram showing where the wires run and where they end up?

Just a quick, half-assed Google search, but I found this:

-3-wiring-harness-wiring-diagrams-here-2005pcmc2p3.gif

Not totally sure it applies to your Denali. But, pin #58, tan with white stripe. I'd guess that the low reference for it would be the one next to it (pin #57, black). I'm not certain, though.
 

swathdiver

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I am a little confused as to when you would use the different oil pumps.
From what I can tell there are three.
1. Regular volume, regular pressure.
2. High volume. Regular pressure
3. High volume high pressure.
(Correct me please if these are wrong)

So I'm wondering which new oil pump to put in this engine.
Also...
I've seen a few guys add a washer to the oil pump bypass spring assembly to increase the pressure needed before the bypass kicks in.
Any thoughts on that little hack would be appreciated also.
The pump that belongs in your engine is the GMOE 12710303. Don't mess with it, leave it alone, let it function as designed.

 

Sam Harris

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I went through 3 or 4 sensors before I got one that actually worked as it is supposed to. All but one were AC Delco. It’s a cheap part, and seems not great QC.
 

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