Question about GMC G3500

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No oil pressure. Can not locate the oil pump drive.

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  • stebeck57 Jan 11, 2009

    Thank you. That helps but can you tell me what drives it? I think that is where the problem lies. It doesn't have a distributor.

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  • 141 Answers

Have to drop the oil pan on this one.

Posted on Jan 11, 2009

4 Suggested Answers

csmock132
  • 4669 Answers

SOURCE: oil pressure gauge fluxuates

The oil pump is in the pan at the bottom of the distributor.

Posted on Feb 27, 2009

  • 2 Answers

SOURCE: 1994 buick regal

More than likely (and we will hope) it is the oil sending unit. In comparison it is a very cheap and quick fix to replacing the oil pump. Auto Zone has a pretty good componet location section that has tips for replacement if you cant find the sending unit or the oil pump. Try that first it may save you a lot of work.

Posted on Apr 08, 2009

  • 416 Answers

SOURCE: oil pressure drops on gauge but i just put new oil

back of engine behind intake manifold

Posted on Jan 18, 2010

  • 610 Answers

SOURCE: i;ve lost oil pressure the needle stay's down

Stop driving it now! Have someone check the actual oil pressure with a manual gauge, which will be installed where the oil pressure sender normally goes. You may have a problem with the gauge circuit, but you may have no oil pressure, which will destroy your engine. Don't take that chance. Get it checked out!

Posted on Jan 03, 2011

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1 Answer

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More than likely (and we will hope) it is the oil sending unit. In comparison it is a very cheap and quick fix to replacing the oil pump. Auto Zone has a pretty good componet location section that has tips for replacement if you cant find the sending unit or the oil pump. Try that first it may save you a lot of work.

Mar 29, 2009 | 1994 Buick Regal Gran Sport

1 Answer

Fuses


The first thing you should do is to locate the oil pressure switch/sending unit.

This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM2 fuse blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

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1 Answer

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