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Old 05-16-2008, 01:59 AM   #1
tjvending
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Gas Gauge problems-

I having some gas gauge problems; Problem one, my needle fell off of the gauge and I got it back on. I put a new sending unit in because I couldn't get the gauge to read correct, its off. I let my truck run out of gas so I could tell where a empty tank would be. I then placed the needle to empty, I went and had ten gals of gas put in, it nows reads a full tank and and half. How do I get this read correct?

TJ
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Old 05-16-2008, 02:05 AM   #2
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Re: Gas Gauge problems-

My guess would be the new sending unit is a different ohm than the gas gauge, could of been the problem previously too. The stock gauge is 90 ohms and the sending unit should be the same.
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Old 05-16-2008, 02:21 AM   #3
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Re: Gas Gauge problems-

When you disconnect the wire from the tank w/ key on it should drop to E. If that is true you could ensure U have a good GRD by adding a wire to each the gage panel & sending unit. Retrace wire from tank to dash. Only if you have the correct 90 OHM sending unit & gage.
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Old 05-16-2008, 04:28 AM   #4
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Re: Gas Gauge problems-

Try this
http://www.6066gmcguy.org/Electrical-02.htm
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Old 05-16-2008, 07:07 PM   #5
tjvending
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Re: Gas Gauge problems-

Does it matter where you place the needle if it fell off? Does the gauge reset itself if this happens. I thinking I don't have the needle in the correct postion
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Old 05-22-2008, 09:55 PM   #6
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Re: Gas Gauge problems-

Does it matter where you place the needle if it fell off? Does the gauge reset itself if this happens. I thinking I don't have the needle in the correct postion. Its jumpimg all over. I did the unhooking of the wire at the tank and its go to full then I groung it and it goes to empty.

TJ
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Old 06-06-2008, 12:45 PM   #7
tjvending
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Re: Gas Gauge problems-

Needle fell off again, does it matter where you replace it back ? location.

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Old 06-06-2008, 01:03 PM   #8
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Re: Gas Gauge problems-

Yes the clocking location does matter.

You can index it with a full or empty tank. Put some dielectric grease on the lead wire that plugs into the sending unit.

Also clean a small part of the tank behind one of the mounting bolts and threads for a good ground for correct resistance.
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