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2000 GMC SIERRA
150,000 MILES • 4.8L • V8 • 2WD • AUTOMATIC
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SSROBERTSON
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I bought a non running project truck (listed above). My problem is a few actually, first I'm not getting power or ground to the fuel pump. Fuel pump, and filter are new and can force pump to run by running straight from the battery. I have checked all fuses and relays... Truck will run at this point.
Second issue is: I cannot get the instrument cluster to light up mileage, security, fuel level and temperature gauge. The voltage, speedometer, tachometer (I think), check engine light all come on. I have bought a new body control module that was already programmed to my VIN and it does the exact same thing. Even swapped used gauge cluster from the junkyard and it does the exact same thing. I'm at a complete loss on this thing and just need some help. Thanks in advance for any help that can be given.
May 2, 2021 at 7:43 PM
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ASEMASTER6371
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Good morning,

I attached the wiring diagram for you of the fuel pump and the engine control system.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Check at the relay for power at terminal 30 with the key in the on position. You should also have power at 85 for 2 seconds with the key on. Then when you crank it, it should be full voltage.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy

May 3, 2021 at 5:02 AM
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SSROBERTSON
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I have checked fuses and relays but I will check some of the sensors to see if maybe that could be the issue. The truck will start and run if I run the fuel pump direct from the battery. One of the most confusing parts is the issue with the cluster.
May 3, 2021 at 5:53 AM
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ASEMASTER6371
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It is not a sensor at all.

You need to do the voltage checks I suggested to see what is not allowing voltage to the pump.

Roy
May 3, 2021 at 6:01 AM
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SSROBERTSON
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Okay. Will do. Any chance the two things (fuel pump and cluster issue) are related?
May 3, 2021 at 6:05 AM
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ASEMASTER6371
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No, they are not related.

We can address the cluster in another question. We can only answer one issue at a time as per site rules.

If you start a new question, I will be happy to help with the cluster issue.

Roy
May 3, 2021 at 6:24 AM
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SSROBERTSON
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I was unaware of that. I will make another question for the cluster... Thank you
May 3, 2021 at 6:25 AM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
May 3, 2021 at 6:26 AM
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SSROBERTSON
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Checked voltage at cam position sensor and have 5 volts on white wire (far right in picture). Also checked fuel pump relay terminals and getting power on 30 and 2 seconds on 85. Had helper cycle key and rechecked at pump still no prime or power while cranking. Also appears no ground either.
May 3, 2021 at 5:51 PM
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ASEMASTER6371
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Okay, when you turn the key to the on position, does the relay energize and click?

If it does, check the wire from 87 to the pump. If it does not, then yes, it could be the ground for the control side of the relay. The ground is G117 in the diagram and it is located on the rear of the engine. It is usually on either the cylinder head or it could be attached to the bell housing bolt.

Roy
May 4, 2021 at 3:16 AM
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SSROBERTSON
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The relay does click. I had a feeling it could be that wire was damaged (I had to do this on a friend's truck before, seems like it's common). I will try to run a new wire and see if it resolves my issue. I will keep you posted. And I did put through another question for the cluster issue. Thank you for your help Roy!
May 4, 2021 at 3:24 AM
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ASEMASTER6371
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You are welcome.

Keep me updated.

Roy
May 4, 2021 at 3:32 AM
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SSROBERTSON
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Update: I ran a new wire from 87 to fuel pump and now have power as I should. Only thing I noticed is I had to ground the fuel pump to make it come on. Other than that it works perfectly now.
May 7, 2021 at 2:38 PM
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ASEMASTER6371
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Good job.

How does it run?

Roy
May 7, 2021 at 3:21 PM
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SSROBERTSON
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I haven't got that far yet, lol. Still an ongoing project.
May 7, 2021 at 3:43 PM
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ASEMASTER6371
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Okay, keep us updated.

Roy
May 7, 2021 at 3:50 PM
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SSROBERTSON
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Will do Roy!!

May 7, 2021 at 3:55 PM
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SSROBERTSON
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Hey Roy, once I get this truck fired up it runs pretty rough and wants to stall at first "cold blooded". But while you are trying to get it to smooth out it has a decent amount of smoke out of the tailpipes. It's running very rich. Now keep in mind this truck hasn't been driven much over the last few years, but always garage kept. I'm sure some of it may be condensation from sitting but not sure why it runs like an old loaded up carburetor. It has new Delco iridium plugs and newer wires.
May 10, 2021 at 5:52 PM
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ASEMASTER6371
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Did you drop the tank and flush out all the old fuel and change the pump? If it has been sitting for years, the fuel is no good at all.

Roy
May 10, 2021 at 5:55 PM
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SSROBERTSON
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Yes I did. I replaced the fuel with 93 and a bottle of decent fuel injector cleaner. It also has a new fuel filter, but it was changed just before I drained the fuel. I think it should be fine since the tank is plastic and the fuel didn't seem to have any junk in it. I also did replace the pump.
May 10, 2021 at 6:00 PM
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ASEMASTER6371
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Okay, change the filter again. You still have old fuel in the lines. It will take time to get that out.

Roy
May 10, 2021 at 6:33 PM
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SSROBERTSON
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Okay. I can try that and see what happens.
May 10, 2021 at 6:35 PM
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ASEMASTER6371
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Keep me updated.

Roy
May 10, 2021 at 6:35 PM
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SSROBERTSON
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Hey Roy, finally got a chance to take the truck for a quick test drive. It seems to be running pretty good for something that's been sitting off and on for the last 8 years. I noticed tho that it still has a slight miss and seems to be running rich. When you first start it up it won't idle but after a moment or so it will idle around 500 RPMs. It has new plugs and wires. The plugs that came out of it looked relatively new but were black and smelled like gas even after sitting for about a month without being started.
May 17, 2021 at 7:39 PM
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ASEMASTER6371
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You are going to need to drive it for a while and get it nice and hot. It could be from just sitting.

Roy
May 18, 2021 at 1:18 AM
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SSROBERTSON
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Okay, awesome. I was thinking that may be the answer as well.
May 18, 2021 at 5:01 AM
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ASEMASTER6371
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Yep, keep us updated.

Roy
May 18, 2021 at 5:57 AM
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SSROBERTSON
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Roy I submitted a new question... I know I know lol.
May 21, 2021 at 7:40 PM
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ASEMASTER6371
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Okay, I will check.

Roy
May 22, 2021 at 2:45 PM
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SSROBERTSON
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Thank you.
May 23, 2021 at 7:06 PM
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ASEMASTER6371
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Anytime.

Roy
May 24, 2021 at 9:42 AM
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SSROBERTSON
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Roy, is there anyway to get an email directly to you?
May 24, 2021 at 10:12 AM
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ASEMASTER6371
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No, we have just this thread for communication.

Roy
May 24, 2021 at 2:35 PM
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SSROBERTSON
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Okay. Thought I would check, might make it easier.
May 24, 2021 at 2:36 PM
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ASEMASTER6371
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No problem at all.

Roy
May 24, 2021 at 2:39 PM