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I'm assuming this has dual tanks, do you know if it is not working on both tanks ? Most people would check the circuit for the gauge at the tank. The sending unit grounds the gauge on the dash.
Does the check engine light go on??? there have a couple possible causes for your issue, one could be a clogged fuel filter, another could be a plugged catalytic converter.
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Talking about fuel gauge issues and how do you how do you diagnose, ... is the dash unit right here, and obviously the gauge doesn't read correctly. ... to fix the fuel gauge, so you can actually fix the fuel gauge electronically by reflashing the program. ... How to Troubleshoot a Malibu Fuel Gauge & Dash Light Not Working...Could be a bad fuse - fuse # 17 is a 15 amp fuse for the fuel gaugeCould be a bad float on the fuel gauge sending unit inside the gas tank (
it's with your electric fuel pump ) If the float gets a pinhole or
crack in it , the float fills with gas and sinks so the gas guage reads
empty all the time Could be a wiring problem
The first thing i would tey is changeing the fuel filter. Chevy has a problem with the design from the fuel pump to the fuel inlet on the intake manifold. What they did it is back up the power supply to the fuel pump from the fuel relay and split the curicut and ran the back up through the oil pressure sending unit . So even if the relay went bad while driveing the fuel pump would still get power and the truck wouldn't die on the road its a saftey thing .But if the relay is bad then the engine needs to build up enough oil pressure to trip the oil sending unit to send power to the pump from cranking thus a long cranking time when cold . Change the fuel filter first it should be replaced every 4 to 5 years anyway . A nd if that dosn't fix it try the relay it should be behind a panal inside the glove box on your truck and if that dosn't work replace the oil pressure sending unit. One of these 3 things should work if the fuel pump is working correctly
your fuses are located on the divers side when you open the door, just pull the panel off & on the back of it should tell you exactly what fuse to look for...
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