How to fix fuel gauge on GMC Duramax?

Cut the tie and pull the wires from the harness and inspect for cuts and wear. The sharp corner of the FICM bracket where it is tied down to, cuts into the wires. Repair and insulate the harness with a short piece of heater hose.

Why is the gas gauge on my Silverado not working?

Fuel gauge is not reading the proper level of Diesel fuel in the tank. The fuel gauge has been erratic for the last 50000 miles. It tells me the fuel level for a short period and then goes to reading empty.

What is the Dorman number on the fuel gauge?

Today I replaced the electrical connector for the fuel sending unit at the rear tank and it solved the problem. The Dorman part number is 645-668. I hope this information can be helpful to those dealing with this annoying gauge issue.

What does it mean when your fuel gauge is full?

When this happens you’re left guessing how many miles you have left on your tank of fuel while your fuel level gauge bounces around from empty to ½ a tank to ¼ of a tank to full and back again. If this is the trouble you’re having, you’ll need to get your truck to a local mechanic for diagnosis and repair.

Where is the fuel gauge on a Chevy Silverado?

My 2000 Silverado did almost the exact same thing. Bought a new full pump assembly (because the level indicator was part of it), dropped the tank and swapped it out. Problem solved. If you look under your truck, you can see your tank.

Why is my fuel gauge not working on my Duramax?

This wasn’t my only issue and I got pissed and GM got engaged from the GM dealer that sold me the tank. Inevitably we found out from GM Engineering it was the computer trying to re-calibrate due to the mileage driven with no change in fuel level.

When does the fuel gauge go down to empty?

Let me start off by telling you what it was doing. First time i noticed it it stuck on full for about a week then went down to empty. After about a week of being on empty ever since it will show full right after i fill the truck up and seem somewhat accurate to 1/4 of a tank.

What’s the fuel milage on a Chevy Duramax?

So my truck (2500 CCSB 4×4) is very speed dependent for decent mileage. If I keep a calm foot on the skinny pedal, I can keep it in the low 20’s without trying hard. But as I get into the upper end of the speed range, the economy takes a dive and will cost at least 5mpg or more.

How does a transfer pump work on a Duramax?

There is a transfer pump on cab and chassis models, with two tanks– the system is suppose to be computer operated, and move the fuel from the rear tank, to the side tank, as the side tank gets low on fuel.

Where does the fuel gauge come from on a Duramax?

I was in the process of installing an aftermarket gauge when I came across a wiring diagram of the fuel system on the internet (alldata). There are two wires coming from the ecm that work the fuel gauge so I took apart the fuse box to check if I seen anything obvious. It seemed as though all the wires were where they were supposed to be.

Why is my fuel gauge not working on my Chevy?

By the way this is a 2004 chevy cab and chassis w/dual tanks. This is a list of what steps I took. Checked fuses cause I was getting no voltage to the sending unit. Went ahead and changed front tank sending unit ($125) still not working. So next was my biggest mistake and took it to the dealer.

How to fix fuel gauge on GMC Duramax?