Gas gauge working good but truck stalls at 1/2 tank

SOURCE: Gas Gauge not reading correctly

The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.

SOURCE: gas gauge is wrong

It is likely that its the sending unit in the tank. One way to determine if its the guage or the sending unit is to ground the wire from the guage and it should peg out. If it doesnt then its the guage if it does then its the sending unit.

Dennis Mulford

• 1055 Answers
• Posted on Apr 20, 2009

SOURCE: gas gauge on 1993 thunderbird not working

you need too replace the sending unit in the tank!!!!!!!

SOURCE: FUEL GAUGE SHOWING FULL TANK BUT BUT ONLY HALF TANK OF GAS

Hello. You may have a problem with the fuel sending mechanism in your gas tank or you may have a fungus in your gas tank which is causing it to show much more fuel than you actually have. Drive to an AAMCO repair shop where they will scan your car's computer for free [some auto parts stores now offer this free as well so call around]. If it is mechanical it should show up on the scan, if not you probably have the gas fungus. Some auto parts stores and dealerships now sell an expensive gas tank additive that will kill that fungus. Regards, Joe

SOURCE: Why is gas gauge not working correctly since fuelpump was replaced.

Is this a flex fuel vehicle. If so, call the dealership and ask the parts dept. if there is a gauge module (perhaps behind the instrument cluster). This may be the culprit and needs to be replaced.