Fuel gauge!!!

[74baggedbug]

What could be causing my fuel gauge to read like this , it's a new cluster and brand new circuit board .. Thanks for any help/tips
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[FTP]

bad sending unit

[FTP]

or, lost ground?

[74baggedbug]

Well I have a fuel cell under the bed , I will start there and check the ground 1st and if that doesn't work then ill order a new sending unit . Thanks
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[69moneypit]

I was about to post about my fuel gauge not working , my cluster and sending unit are new . Where would the ground wire be ?
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[GMCJOE]

What gauge setup did you have in your truck previously? Idiot cluster or Gauge Cluster?

[GMCJOE]

Originally Posted by 69moneypit

I was about to post about my fuel gauge not working , my cluster and sending unit are new . Where would the ground wire be ?
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The tank itself is the the ground. You can always check to see if it is a grounding problem by taking a piece of wire putting it anywhere on the sending unit that is metal and grounding it to a known good ground. If it works right, you know you have a grounding issue.

[Littletony]

Originally Posted by GMCJOE

The tank itself is the the ground. You can always check to see if it is a grounding problem by taking a piece of wire putting it anywhere on the sending unit that is metal and grounding it to a known good ground. If it works right, you know you have a grounding issue.

If this does not make it read full then you have a power issue.

[VetteVet]

This is an indication that the sending unit wire to the gauge is grounded to the frame and not grounding through the resistor in the sending unit. Pull the sending unit wire off the unit at the tank and with the key on you should get a gauge reading at 3:00 o'clock.

If it still reads where it's at, then pull the sending unit wire off at the fuse panel and re-check the fuel gauge. if it then goes to the 3;00 o'clock then the sending unit wire is grounded between the fuse panel and the sending unit. Possibly pinched and grounded somewhere.

[74baggedbug]

What sending unit can I use for the fuel cell? I'm gonna try and fix it this weekend coming up and just trying to get all the parts ready
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[GMCJOE]

http://www.egauges.com/vdo_indS.asp?...90ohms&PN=SN38
This is just an example, one that I am thinking of using on my 40 gallon cell. They have others listed that you can choose from, or just an idea of what you can use.

It has to be a 90 ohm sending unit.

[Square_78]

Did you just do the white face gauges on it? Needle may have been installed in the wrong position. When i did mine i was careful to reinstall the needle in the same position as it was before i took it apart.

[74baggedbug]

Originally Posted by Square_78

Did you just do the white face gauges on it? Needle may have been installed in the wrong position. When i did mine i was careful to reinstall the needle in the same position as it was before i took it apart.

I thought the same thing but I rotated the needle after the 1st time and it went back to the same exact spot
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[Square_78]

Did you pull the needle off and reposition it? Fill up the truck with gas at the gas station, pull the custer out, pull off the needle, and then carefully push the needle back on so its lined up with the "FULL" marker. Try NOT to rotate the needle at all while doing this. Get it so that its resting and lined up with "full". Its kinda tricky to get those needles back on and lined up properly.