Fuel level sensor.

[Budneeds2beers]

Hey guys, well it appears my level sensor went out. Guage is stuck on E with the light on but the tank is full. It was funny thinking I was out of fuel and racing allover to fill up just to find out i had half a tank. (Asshole truck lol) any who, does anyone have a part number for a new sensor or does the whole drop in unit have to be changed? Its an 04.5 if anyone has a part number that would help. I was looking around all night and it pulls up sending units for the gassers.

 

[c20elephant]

Rockauto for the sender only.

http://www.rockauto.com/en/moreinfo.php?pk=947508&cc=1431804&jsn=465

ACDELCO SK1221 {#19148811} GM Original Equipment; Includes Seal http://www.rockauto.com/en/moreinfo.php?pk=947508&cc=1431804&jsn=465

STANDARD MOTOR PRODUCTS K07025 TechSmart

 

[CarolinaHD]

I have the entire assembly that goes in the tank from a 2006. Let me know if it works and we can make a deal.

 

[TheBac]

So they're FINALLY selling the proper sending unit for our trucks? We dont have to modify something else to work? About damn time.

 

[CarolinaHD]

I believe lb7 is different from 04.5 up. So you'll still have to modify yours more than likely.

 

[TheBac]

You know, I think you're right.

 

[CarolinaHD]

It's not often that I am

 

[c20elephant]

I have the entire assembly that goes in the tank from a 2006. Let me know if it works and we can make a deal.

Will not work, LLY and LBZ are different

 

[Budneeds2beers]

Well poop. That little piece of cr@p is $140. Wonder if mine can be fixed first.

 

[CarolinaHD]

According to Rock Auto all the part numbers are the same for LLY and LBZ. Let me know if you want it and you can have the whole assembly cheap.

Sent from my SM-T810 using Tapatalk

 

[BrandonLLY]

Did you check to see if the float is stuck?

 

[c20elephant]

According to Rock Auto all the part numbers are the same for LLY and LBZ. Let me know if you want it and you can have the whole assembly cheap.

Sent from my SM-T810 using Tapatalk

Oops, typical of GM, the assembly is different at the top. Kennedy diesel has some pictures of the LLY and LBZ differences.

 

[2004LB7]

I used a AutoMeter 3262 Universal Fuel Level Sender and rescaled it in efi live so the gauge was more lenear. It is just a sender so I left the fuel pickup in place.

 

[Budneeds2beers]

I havent messed with it yet. I have Monday Tuesdays off so i will later.

Carolinahd let me bang on the tank and mess with it first and if no result then ill hit you up.

 

[jlawles2]

Have you done anthing to the truck around the fuel cell or under the fuse block? I know when i pulled the cab on mine, i bent a pin on the connector under the fuse block. Strange things did not work.

You can reach the plug on top of the tank and try bridging it with a resistor to see if it changes in the cab. If it does, then its the sending unit, if not, then its something else.

 

[Budneeds2beers]

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

 

[jlawles2]

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.

 

[Budneeds2beers]

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.

 

[2004LB7]

240 ohm empty to 33 ohm full

 

[c20elephant]

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/media/photo/99/2006_LD_CKFullSizeElectrical.pdf