GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Low fuel light comes on even with full tank (1999 GMC).

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Old Jul 18, 2007 | 12:20 PM
  #11  
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or do they not come with the sending unit
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Old Jul 19, 2007 | 09:16 PM
  #12  
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maybe i should start my own thread instead of posting in one i searched


j/k dont hurt me
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Old Jul 31, 2007 | 03:24 PM
  #13  
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O.K. guys I will say this. My truck was doing the same thing. Just filled the tank and the "low fuel" light is on and the needle is empty. Shake the truck back and forth and the light goes off and the needle goes to full, then a few miles down the road "low fuel" again. Oh and mine is a Y2K ECSB, Z71, 5.3

SO, I just happen to work at a place where we do fleet vehicle maint on some government vehicles. A buddy of mine just got done replacing a fuel pump assembly on an '02 Silverado. Took the fuel level sending unit from that old one home with me.....

Found this.....

The '00 and '02 are different to the point it is NOT a remove and replace item. And getting around trying to get the new one to fit I broke it!!! SO, I figured since I had the tank out and the old one out of my truck I figured I would clean it.

YOU CAN REMOVE THE "board" from the level sending assembly. Then using a wire brush and some contact cleaner I lightly cleaned the surface of this "board". It looks like an old "re-o-stat" type speed control for the old remote control cars. Anyway, after I put the old unit back together and back in the tank and back in the truck. IT WORKS without problems!!!

WARNING WARNING WARNING

When you remove this "board" from the assembly be very carfull. The sensor "fingers" are very thin metal and will bend very easy. These need to keep in contact with the "board" when assembled or it will not work.

I in fact bent mine trying to use the other unit. SO, in order to straighten the "fingers" back to useable state. I drilled a 1/4" hole in the middle of the housing (without the "board" in it). Then took two small screwdrivers and one from the back and one from the front straightend them back into position.

Once you have either cleaned or cleaned and repaired "fingers", put the assembly back together gently and carefully enough to not bend the "fingers" again. Reinstall it back onto the side of the pump, plug it in, and then test. Have someone in the truck and turn the key on (the pump will spin for 2sec then shut off). Then play with the "fuel level arm" on the pump. Push up for full tank and then back down. There should be no "low fuel" with it all the way up. Then turn the key off and reinstall into tank and put the tank back in the truck. Now you should have a correct operating fuel gauge again.


I am sorry I did not take any pics of doing this. But if anyone has any questions feel free to email me and I will help in what ever way I can!!! speedextreme@hotmail.com. Hope this helps a bit!!!

Laters
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Old Aug 6, 2007 | 03:53 PM
  #14  
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tag nice info
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Old Aug 14, 2007 | 12:55 AM
  #15  
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mine does this too. 00 RCSB 4.8 can be annoying when you are actually low on gas...but not quite sure how low.
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Old Aug 14, 2007 | 08:39 AM
  #16  
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my 01' silvy i just got does this to... ill just drop the tank and take it to my buddy and tell him to fix w/e it is and give me the bill, not in the mood to deal wit it myself
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