I've had this car for about a couple of months and everything was fine. Now the gas gauge seems to be going down a little quicker than it should. I thought I did a bit too little driving for it to be time to fill up again, but when I did go to put gas in the car, it only took a couple of gallons for the pump to say my tank was full. Sure enough, when I got back into the car and turned it on, the gauge read full. Drove around a bit around my neighborhood, and noticed that it was still droppin a bit quick. What do I do?
Also a known issue with the gauge itself. DC motors go defective. The gauge is actually a D.C. motor.
Check the wiring on the sender unit , ground wire for good connection it masy be a gauge and resistor problem but I suspect it is in the wiring or the sender unit at the tank
SOURCE: filling gas tank
There is a vent pipe that runs along the fill pipe, they get kinked and cause this concern (tank can't vent air when filling), the only fix is to replace the fill pipe assembly.
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: 1986 f-250 duel tanks fuel gauges not registering right
id say either your sender unit is nackered or you have a bad earth to the body
SOURCE: 2000 Ford Expedition Starting problem
If the fuel gauge drops off when you are driving then its a sending unit problem that means you have to drop the tank and replace the float and sending unit. This is a common problem for alot of cars because of cheap gas. If you have to drop the tank check the fuel pump canster for dirt because of cheap gas. Replace the fuel pump strainer and fuel pump filter. If the car or truck has about 100,000 miles you might want to change the fuel pump at that time also just to cover your back. If you take it to a shop they will charge you at least $900 to start. But if you do it yourself it will cost you about $200 dollars maybe alittle more.
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