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According to this it is a know issue and the gauge has a reset procedure.
How do you reset the fuel gauge on a Chevy Suburban?
Press and hold the "Trip/Odo" button. Turn the ignition switch on and hold the "Trip/Odo" switch for about two seconds. Then, release the "Trip/Odo" button, press it again (do this three or four times), and finally hold it for about four to five seconds until the leveling information shows on the Odometer.Jun. 19, 2021
It could be a short in the instrument cluster-maybe one of the non-working gauges. You could pull the cluster out and try to find it, or just try another cluster from a salvage yard.
there is a fuse for the gauges, if you have an owners manual it will tell you exactly where it is, if not there is a fuse panel inside, either under the dash on drivers side, by the driver side kick panel, or on the side of the dash that faces the door.. and there is also a fuse/relay panel under the hood.
hope this helps.
If your sending unit is one wire, unhook it from the sender and place a jumper wire from wire to ground. Turn ign on, gauge should pep high PSI. Two wire plug, place jumper between contacts of wires (unplugged). Same thing. What this does is isolate the gauge. If gauge pegs on test, replace sender. If it does it again with new sender, it's the pump. But it's probably the sender.
Most likely it's the oil sending sensor, located beside the oil filter. You can change it, just be sure to have old newspaper or rags laying around the area where you will work, because a little oil will be lost. The part isn't expensive, for mine on a Ford Expedition was around $35 and took 5 minutes to change. Just un-plug the connector going to the sensor, and a larger wrench will be needed, large (7/8, 15/16) somewhere in that range of size.
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