Filled up my gas tank this morning, got back into my truck and noticed the fuel gauge slowly crept up to a 1/4 tank of gas. I turned off my vehicle, and turned it back on and gauge didn't move. I drove down the road for about 5 minutes and the gauge move up a little bit. Got back into the vehicle 4 hrs later, and now it shows 3/4 of a tank full. I have never had this problem with my truck before.
I'd use a couple of resistors representing full and empty. Take connector loose from fuel level sending unit at gas tank, two wires, use resistor between the proper two wires, turn key just to on, you shouldn't have to start it. If gage reacts properly to both resistors, I believe the problem is the sending unit in the gas tank. If it still doesn't function properly, have to check wiring circuits and instrument cluster. The resistor ohms, 16 ohm--and 158 ohms. These are just generic specs.
Some ford instrument clusters can do a self test. The only problem I have is, I don't which years this applies.
With the engine off, depress and hold the odometer reset button. Turn the key to the run position and hold until the gages sweep, within 5--8 seconds. Depress the reset button once to advance to each stage of the self test. Turn the ignition to the off position to exit self test. This test is w/o outside input, so if all gages sweep except the fuel gage, I suspect the instrument cluster has a problem. I'm not sure if your instrument cluster has the self test ability?
SOURCE: fuel gauge not working on 2005 ford mustang
Sending unit is in gas tank. usually as an assembly with the electric pump. These aren't cheap either, If you know a mechanic you can trust ask him how much to install a new one, I can get them wholesale for less than two hundred dollars, but of course retail probably more like 250.00 Hope this helps you!
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: Fuel gauge registers empty after fill up
It sounds to me like you have a short in your wiring harness at you fuel tank. there is a plug on top of your fuel tank that controls you fuel pump and your sending unit that tells you how much fuel is in the tank. This plug can be a real p.i.a to get to on some vehicles, you may have to take the vehicle to a shop to fix it, if you are not mechanically inclined.
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
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