gas gauge question need help

[331strokerstang]

i have a 2000 mustang v6 in awesome shape had it 2 months or so but anyhow the gas gauge doesnt work properly im stuck between cluster or sendor, its either above full or below empty, when i fill up its above full untill about 140 miles then drops below empty everytime it has properly worked once or twice

 

[jrod2423]

well i know when i bought my 98 3 years ago the fuel gauge only went to a little bit above a quarter of a tank and that was empty, but my fuel pump was bad at the same time so i had the fuel pump replaced and my fuel gauge works perfectly everytime, so basically if your car is acting like mine did, then this might be a warning sign that your fuel pump is gong out of your car.

 

[331strokerstang]

i checked resistance on it and it has 119 ohms or something like that doesnt whine or anything like it is going out have an extra just in case lol

 

[wmburns]

Do you have a Ford workshop manual, wiring diagrams, and PCM manual for your car? If not, I maybe able to help. PM if interested.

Check out the following on how to access the cluster diagnostic mode. This will help you figure out if the problem is a bad sender or a bad gauge.

Diagnostic Mode - Ford Mustang Forums