Duramax Diesels Forum Truck of the Week
  #16  
Old 01-08-2017, 08:23 PM
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Budneeds2beers Budneeds2beers is offline
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No i havent done anything to the truck it just happened. The funny thing is i got out of the truck and thought to myself, oh sh!t i better see how much fuel i have. So i checked it. tank was above a quarter. So i put a check in the teller then jumped back in and went. i left the parking lot i looked again and it was empty... confusion set in.

It probably happened when I hit the speed bump or entered the street. Not a bad idea on how to check with the resistor it is a good point. I was going to throw a meter across it and check the resistance and fuss with it this weekend

Last edited by Budneeds2beers; 01-08-2017 at 08:28 PM. Reason: Finger fumble.
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  #17  
Old 01-08-2017, 10:27 PM
jlawles2 jlawles2 is offline
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You may also want to check the grounds.

Wiring from the top of the tank travels along the driver side frame rail, and goes under the fuse block. In the fuse block there is a connector for the fuel sensor and the outside air temperature sensor that displays on the rear view mirror. Check GMUPFTTER.com for a wiring pin out of the various connectors. Somewhere also buried in the document there is a set of resistor values for full tank and empty tank. For some reason I think the higher the resistance the more fuel in the tank.
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  #18  
Old 01-09-2017, 01:16 AM
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Ill check it out when i get a dry day here. Were getting pounded with rain now and its my friday so maybe. ( might take a snow day and go play with the family )

Yeah ill have to check out the ohm value for the resister and make a jumper to check out the sensor and if thats all good ill check wiring.
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  #19  
Old 01-09-2017, 08:53 AM
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240 ohm empty to 33 ohm full
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  #20  
Old 01-09-2017, 09:00 AM
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Quote:
Originally Posted by jlawles2 View Post
You may also want to check the grounds.

Wiring from the top of the tank travels along the driver side frame rail, and goes under the fuse block. In the fuse block there is a connector for the fuel sensor and the outside air temperature sensor that displays on the rear view mirror. Check GMUPFTTER.com for a wiring pin out of the various connectors. Somewhere also buried in the document there is a set of resistor values for full tank and empty tank. For some reason I think the higher the resistance the more fuel in the tank.
https://www.gmupfitter.com/pdflists/view/6

https://www.gmupfitter.com/files/med...Electrical.pdf
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