memo0226

Hello, i have just bought a 1999 Mustang GT with 138K i love this car, its everything ive ever wanted. But i do have a question. So when i bought it, she had 1/2 a tank. I drove her till the low fuel light came on. When that happened i noticed the needle was below E. I took her to a gas station and filled her up with about 15 gallons of 91. I started her up and noticed the gauge only showed 3/4. It wont go past 3/4. Ive been doing some reading and saw people talking about a stepper motor or possibly a sending unit. What do you guys think? please help.

Pop's Stang

Sounds like a sending unit to me. I had a car like that before. It will just get worst the longer its in there. Replace it now if you can.

Cockygt500

Welcome to a awesome forum and good luck with your gauge issue.

Soldier GT

Did you get it fixed?

memo0226

no i didnt. i havent really had time to sit down and try ordering anything. But i do notice that i have a " check gas cap " light on. i replaced my gas cap and tried finding a code but no luck

Stevo86

The way the sending unit works is by passing a small amount of current through a wiper as it passes over some conductors. The resistance varies as a bobber moves it up and down with the fuel.

Over time these can build up some crud increasing the resistance in the circuit causing a false reading like what you have. It's an easy fix you just have to clean the contacts off. However, it is inside the fuel tank so if you can live with it I would unless you have to replace the fuel pump.

memo0226

yeah i can live with it, just a little annoying lol

uberstang1

Sorry about your issues, but welcome to the forum