Question about 1991 GMC Sierra

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My oil pressure gauge is high and blowing fuel line fuse in '91 GMC Sierra

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  • 230 Answers

Check wires from sender make sure they are not broken pinched grounded out i had this same issue with my 89 3500 454 and the wires were rubbing the balancer finally wearing through grounding them this told the computer there was an issue with oil pressure and blew the fuse to prevent engine damage i traced them out and fixed never had an issue again

Posted on Apr 25, 2015

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Posted on Jan 02, 2017

DAD5bbbbg
  • 111 Answers

SOURCE: 2004 GMC Sierra High Oil Pressure

if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

Posted on Mar 14, 2009

  • 1348 Answers

SOURCE: My 2003 GMC Sierra Z71

the oil pressure is always high when you start it,the oil is cold and creates a different reading.
a few things...to consider
oil pressure sender defective
too much oil
wrong oil type

Posted on May 13, 2009

dennymulford
  • 1055 Answers

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

  • 116 Answers

SOURCE: 2003 GMC Sierra Knock sensor and oil pressure??

the knock sensors are located below the intake plenum,or,upper intake manifold as some call it, they screw into the lower intake, the front one is sensor 1, the rear is sensor 2. it is wise to change both if you have some miles.since you are going to be buying a gasket set to do this job.the sensors are cheaper than the gaskets.

Posted on Jun 12, 2009

fixitriteman
  • 431 Answers

SOURCE: LOW OIL PRESSURE ON 2007 GMC SIERRA 1500. CHANGED

have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds

Posted on Mar 11, 2010

Testimonial: "thanks alot.truck is not making a rattling noise.we did check it with a manual gauge.it read about 10 at idol. press. gets better as you incr speed"

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1 Answer

What is wrong when your oil pressure gauge reads too high?


blocked oil lines , galleries , try flushing engine with flushing oil and change oil and filter as a starting point

Mar 13, 2015 | 2003 GMC Sierra 1500

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Why my oil pressure raises while idle, then falls when engine is reved


Likely electrical issue or bad fuel pump which draws excessive amps when reving up thus blowing fuse and creating drain on electrics making oil gauge reading drop.

Feb 10, 2015 | 1991 GMC Sierra

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Oil pressure high all the time


Your gauge shows a high reading

You have to determine the actual oil pressure
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Mar 29, 2013 | 2005 GMC Sierra

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1993 gmc sierra k1500 5.7 V8, fuel system shuts down while driving. Have replaced fuel pump, fuel filter and fuel relay.


Check to make sure oil pressure switch is not sticking or gummed up and connections are tight. Your oil pressure switch is also a safety feature that will shut down fuel pump in case you're in an accident and/or rollover.

Mar 04, 2011 | 1993 GMC Sierra K1500

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I have a 1989 GMC sierra 4.3 Liter, fuel pressure


u can do the check the other way around/ disconnect the fuel line that supply the injectors/ put the pipe in a small plastic container to see if fuel is being supplied by the pump and avoid fuel spill in ur engine/ crank the engine for at least 5 seconds see if the fuel squirts with pressure/ if it does then ur fuel pump is ok / blockage is somewhere down the fuel line/ u can check fuel lines by blowing it with air but u gonna need the help of an air compressor.....

Apr 09, 2010 | 1989 GMC Sierra

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1990 GMC Sierra lifters knocking. Oil pressure


I doubt it....It could be a totally worn out engine.

Nov 13, 2009 | 1990 GMC Sierra

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Oil pressure really high


get the oil pressure sender and gauge checked most likley cause is incorrect reading not sudden high oil pressure

Oct 22, 2009 | 1991 GMC Sierra

1 Answer

2004 GMC Sierra High Oil Pressure


if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

Mar 14, 2009 | 2004 GMC Sierra 1500 Crew Cab

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