fuel tank sending unit problem

[jasonda]

Hello all, I have recently relocated my fuel tank on my 1968 C from inside the cab to the rear. I purchased LMC's Blazer style tank assembly that came with a sending unit for the tank. I know for fact that my fuel gauge properly read before this, however now with over a half tank of fuel, it barely will come up off of empty. Obviously this inferior sending unit that they are supplying with this kit is not compatible in ohm resistance to the stock gauge of these trucks. They (being LMC) are being very uncooperative or helpful with any specs or with providing me with a name of a company who is supplying these units so I can try to figure out the ohm resistance at full and empty to confirm a suspected problem. My question is does anyone know the resistance readings at full and empty of the original sending units for these trucks and blazers are so I can locate a correct unit to correctly read with my original fuel gauge or possibly a supplier who could provide me with the correct sending unit for this blazer tank. Any help would be greatly appreciated.

[LockDoc]

Originally Posted by jasonda

Hello all, I have recently relocated my fuel tank on my 1968 C from inside the cab to the rear. I purchased LMC's Blazer style tank assembly that came with a sending unit for the tank. I know for fact that my fuel gauge properly read before this, however now with over a half tank of fuel, it barely will come up off of empty. Obviously this inferior sending unit that they are supplying with this kit is not compatible in ohm resistance to the stock gauge of these trucks. They (being LMC) are being very uncooperative or helpful with any specs or with providing me with a name of a company who is supplying these units so I can try to figure out the ohm resistance at full and empty to confirm a suspected problem. My question is does anyone know the resistance readings at full and empty of the original sending units for these trucks and blazers are so I can locate a correct unit to correctly read with my original fuel gauge or possibly a supplier who could provide me with the correct sending unit for this blazer tank. Any help would be greatly appreciated.

It isn't that LMC doesn't want to help you, it's just that they don't have a clue. They just don't want to tell you that. That is one of the reasons I don't buy anything from them.

You need 0-90 ohms for the gauge to work correctly. Use your multimeter and test the sender by raising the float up and down.

LockDoc

[raggedjim]

Zero at empty, 90ohms at full

Rg

[71meangreenc10]

Here is what I did.

1. Bought the suburban fuel gauge wire to run up the frame and plug into the fuse box.

2. Replaced the float with a plastic one.

Have had no issues with the sending unit and it has been on the truck for over 10 years.

Smitty