1994 GMC Jimmy gas guage 0n digital cluster

WETESKA

MEMBER
1994 GMC JIMMY
6 CYL
4WD
AUTOMATIC
133,630 MILES

I had the fuel pump and sending unit replaced in late August of 2007. In January of 2008 noticed gas guage (digital) was not working. Guage would not go down. In March of 2008, had fuel pump and sending unit (ACDELCO) parts replaced again. Gas guage worked for a month or so then back to the same problem. In November 2008 it started in drop down below the half tank marking even thought we had a full tank of gas. Dec 24, 2008 go to start car, gas guage is 2 bars below half mark. Go to gas station, will only take 5 gallons. (Assume we have now a full tank), guage still reading 2 bars below half mark. Dec. 25, 2008, start the car, gas guage now show full tank. Drive 44 miles that day, gas guage doesn't move, we were six blocks from home gas guage goes down one bar, turn onto street and into alley gas guage goes down another bar. Has to use 4 wheel drive to get into garage, garage not even with alley and full of ice, guage drops back down to two bars below half way mark. Dec. 26, 2008 start car up gas guage still showing 2 bars below half mark.

1 Reply

SHOULDABOUGHTACHEVY

MEMBER
12 POSTS

First, was the float replaced with the sending unit and pump? The float could have a small hole and might fill up with gas, and then as your tank gets empty the float drains and works correctly again.

I had a truck once that had some sheet metal separators in the tank (to cut down on gasoline rolling front to back) and one of them broke loose and would bang the hell out of my fuel pump and screw up my sending unit on a regular. The only thing I could do was replace the gas tank.

Also, your gauge could very well be bad, or you might have a short somewhere between the sending unit and the gauge.

If there's nothing loose inside the gas tank and the float isn't damaged, I'd find it very likely that your gauge is simply bad considering the sending unit has already been replaced.

Hope that helps.