Question about 1991 GMC C1500

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Pictorial of oil pressure sending unit of 1987 gmc s15 v6 2.8

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Posted on Jan 02, 2017

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Ironfist109

Iron

  • 3018 Answers

SOURCE: where is the oil pressure sending unit on a 1987

  • You should have two of them (which went to one in think 1991 or 1992)

  • The sensor by the distributor is for the oil pressure gauge - see pic below.

ironfist109_274.jpg

  • The sensor by the oil filter worked with the fuel pump power circuit see - pic below.

ironfist109_275.jpg



  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Posted on Oct 02, 2011

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1 Answer

How do you change oil pump in 89 gmc 4.3 v6 s15 jimmy


I'm going to simply "spitball" an answer because i don't know WHY you think you need to change the oil pump.

1st, IF the oil pressure gauge isn't showing any pressure, or low pressure, AND there is no engine noises such as knocking or loud tapping, I would suspect a faulty oil pressure sending unit. IF there's a deep knocking sound then an oil pump isn't going to solve the problem. That is UNLESS it turns out to be what I ran across on a 1991 S10 4x4 with a 4.3. There was a "knocking" sound which I traced to the cover plate of the flywheel/flexplate. Turned out to have a cracked flexplate. Changed it and all was good.

I have a 1985 GMC that showed low oil pressure, yet there was no noises coming from the engine to confirm low oil pressure. I changed the pressure sending unit and it fixed the problem of "low oil pressure".

Now IF you're dead set on changing the oil pump, get ready because it isn't a 10 minute job.

You'll more than likely have to at LEAST raise the engine somewhat as (I'm guessing it's 4x4) the oil pan has a deep sump area for the oil pick up. This is so the oil pan can be shallow in the front area to clear the front differential and cross frame area.

Then you get to try to wiggle, twist, wiggle some more, the oil pan out from between the bottom of the engine/crankshaft, and the cross member of the frame AFTER removing all of the bolts that hold the oil pan in place.

IF it were me, I'd be almost inclined to simply pull the engine, at least part way out of the truck, to gain better access to the pan. AND you wouldn't be fighting trying to keep the oil pan gasket in place while doing the wiggle/twist putting the pan back into place.

Hope this helps.

Feb 19, 2015 | 1989 GMC S-15 Jimmy

1 Answer

Where is the oil sending un it on my 89 GMC S15 4.3 pickup.


in the back of motor next to distributor about 3 inch long screws into block behind intake

Feb 18, 2015 | GMC Cars & Trucks

1 Answer

When you turn the ignition switch on what sends 12 volt power to fuel pump fuse on 86 gmc s15 2.8


The pump relay powers the pump for 3 seconds, then again after oil pressure comes up above 5psi.

Jan 15, 2014 | GMC Cars & Trucks

1 Answer

Where is the oil pressure sending unit on a 1987 gmc s15


  • You should have two of them (which went to one in think 1991 or 1992)

  • The sensor by the distributor is for the oil pressure gauge - see pic below.

ironfist109_274.jpg

  • The sensor by the oil filter worked with the fuel pump power circuit see - pic below.

ironfist109_275.jpg



  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Oct 02, 2011 | 1987 GMC S-15 Pickup

2 Answers

My 1987 GMC S15 with 2.8L starts will run then die like the filter is pluged but it is a new one


check the fuel pressure this year truck known for bad fuel pumps especially after 80k

Jan 24, 2011 | 1987 GMC S-15 Pickup

1 Answer

Where is the oil pressure sending unit?


The oil pressure sending unit is located on the engine block, passenger side by the Distributor. Good luck and make sure you get the right sending unit, there is the simple unit that only turns on a low oil pressure light and the other will send signals to the oil pressure gauge.

Feb 06, 2010 | 1996 GMC Suburban

1 Answer

1987 gmc s15 2.8 litre. Clutch only goes half way


I don't know that specific vehicle, but if its a hydraulic clutch it sounds like either you have a leak and your clutch fluid is low, or the master or slave cylinder could be bypassing internally. Check the fluid level in your clutch master cylinder. If its low, you should top it off with brake fluid and will probably have to bleed the system. Also look for leaks. You can probably find info or a video online of how to bleed the system. Its a bit hard to explain without illustrations or pictures. Not really very difficult to perform. Good luck.

Dec 22, 2009 | 1987 GMC S-15 Pickup

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