I replaced the entire fuel pump and float assembly a month ago. Car wasn’t driven much for several years and noticed that the fuel gauge wasn’t reading correctly on startup a while back so figured the float had gotten fuel logged. Fuel gauge was showing about 1/3 or so with a full tank. I had a new fuel pump and float/sending unit installed. After the new install, fuel gauge still shows about the same. Also, cluster oil pressure gauge reads (and has for decades) readaround 60-70 psi at all temps which is pretty wrong based on the stepper oil pressure gauge that is installed. Other dash gauges (temp/volts) seem to be correct. I searched the forums but didn’t find much relevant info. I know that grounds can be an issue, but what other things do I need to check?
Electrical Fuel gauge problem
- Thread starter SSSnappy '89
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There is a slosh module for the fuel gauge that could be bad and may cause issues with the other gauges. I would recommend that you go to this thread and scroll down to jrichker’s post on "fuel gauge trouble shooting procedures".
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What fixed YOUR fuel gauge? 87-93
So my 1988 GT fuel gauge was stuck on full and the fuel light did not work. (bought it this way) I replaced my instrument cluster with a 1989 unit with 140mph speedo so I could upgrade. After this my fuel gauge read 1/4 and the fuel light works and was on. But when I add fuel it goes to FULL...
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Same here. And yes they are quite proud of them, but I guess when they're the sole source they can be that way. Mine arrived today.
I might try that after I put the new board in. If the capacitor replacement works I could keep it as a backup, but probably other parts on it are getting close to end of life.
It’s mostly the caps that have a finite life. Typically that is all that is wrong with the ECU’s on these cars as well.
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