First the problem is caused by a defective fuel level sending unit, that is located inside the gas tank, the gas tank must be removed to access the part for replacement. As to the how much fuel remains there is not way to know this.
SOURCE: fuel gauge on 2002 focus not working is this just a fuse
could be faulty float in fuel tank but try fuse first
SOURCE: 1966 Ford Mustang Gas Guage not working
I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.
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.
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: 1999 Taurus: Do you have to drain gas tank to change fuel pump ...
No. Just drop the tank.Easier if you remove most of the fuel
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