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Gas guage jumping

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Old Dec 20, 2006 | 09:32 PM
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Default Gas guage jumping

Fuel gauge jumps around within 1/8 tank from actual position. Does anyone have some trouble shooting procedures for the fuel sending unit and guage?
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Old Dec 20, 2006 | 09:48 PM
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Chris, It is the same procedure. Simply stated, ALL gauges bar few are 0-12 volt, volt meters recalibrated/labeled on another scale.
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Old Dec 20, 2006 | 09:50 PM
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What year is your car? Are all the gauges screwey?
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Old Dec 20, 2006 | 10:50 PM
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Check your ground strap at the drivers side rear attached to the frame, that's where the ground from the tank fill neck connects to. And while your at it check all your grounds.
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Old Dec 20, 2006 | 11:13 PM
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Originally Posted by Big2Bird
What year is your car? Are all the gauges screwey?

It's a 1980- temp won't read above 110-120 and fuel jumps around the others are in decent shape.

I'll have to check the ground strap and post back!

Thanks guys for dealing with the noob questions this week. Give me a couple more weeks working under this thing and I'll be much better!

Chris
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Old Dec 21, 2006 | 12:35 AM
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Okay, Check the ground strap. You also have a printed circuit behind the gauge cluster that occasionally goes bad. When I disassembled my console it desintegrated. Let's see what you find, and post back.
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Old Dec 21, 2006 | 01:34 AM
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Originally Posted by Big2Bird
You also have a printed circuit behind the gauge cluster that occasionally goes bad. When I disassembled my console it desintegrated.
This is why I went with some aftermarket gauges. I just didn't want to have to rely on that old circuit setup. Mine was still in OK shape and still worked (except for the clock, but that don't count) but I also wanted to add a few other gauges to the console.
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Old Jan 1, 2007 | 05:09 PM
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Originally Posted by strokervette
Check your ground strap at the drivers side rear attached to the frame, that's where the ground from the tank fill neck connects to. And while your at it check all your grounds.
Any further info on how to find this groung strap?
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Old Jan 1, 2007 | 06:46 PM
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Originally Posted by chrisd0729
Any further info on how to find this groung strap?

At the very left rear of the frame, on the bottom, directly above the driver side muffler, you should find a black lead and a flat metal band (approx1/2"wide) screwed to the frame. If you just find an 1/8" hole, then suspect missing ground.
Last one I worked on had the ground connected to the drivers side marker mounting stud (fiberglass) which caused all kinds of goofy symtoms
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Old Jan 1, 2007 | 07:35 PM
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My fuel gauge reads 1/8 tank high when I turn left, and 1/8 tank low when I turn right. Is this the same problem? I've been making all left turns to try to save fuel.
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