Fuel guage problem - how to tell if it is the sender or guage? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 09-25-2004, 10:32 PM

Can anyone give me some suggestions on how to figure if the guage is good other than pulling the seat and sender to test? Also if I pull the sender can I just ground it to the tank and move it to test it?

Any help is appreciated.

Thanks.

Longhorn Man · 09-26-2004, 05:20 AM

Slide seat forward, unplug the wire fomr tank, ground it. If the guage bottoms out, then the sender is bad. If it stays maxed out, then your brown wire is probably grounded out.

Zeke · 09-26-2004, 03:19 PM

You can also disconnect the fuel gauge wire (brown) from the fuse block. When you disconnect it you gage should go to max (over full), if you ground out the fuse block terminal you gage should move to empty. If it is reading over full now you probably have a broken wire, most likely under the door sill plate.

Longhorn Man · 09-26-2004, 03:25 PM

mt fault, i had them backwards.

**ScottH** · 09-27-2004, 02:18 AM

Thanks guys, I'll try testing it. I have two trucks both with fuel guage problem. One stays at empty, the other at about a quarter. BTW not sure what you mean by disconnecting at the fuse block - i.e. remove a fuse, or does it just connect to a terminal on the block?

Longhorn Man · 09-27-2004, 09:39 PM

A brown wire plugs into the front of the fuse box, that is the one going to the fuel tank.

09-25-2004, 10:32 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Fuel guage problem - how to tell if it is the sender or guage? Can anyone give me some suggestions on how to figure if the guage is good other than pulling the seat and sender to test? Also if I pull the sender can I just ground it to the tank and move it to test it? Any help is appreciated. Thanks.

09-26-2004, 03:19 PM	#3
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	You can also disconnect the fuel gauge wire (brown) from the fuse block. When you disconnect it you gage should go to max (over full), if you ground out the fuse block terminal you gage should move to empty. If it is reading over full now you probably have a broken wire, most likely under the door sill plate. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

09-26-2004, 05:20 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Slide seat forward, unplug the wire fomr tank, ground it. If the guage bottoms out, then the sender is bad. If it stays maxed out, then your brown wire is probably grounded out.

09-26-2004, 03:25 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	mt fault, i had them backwards.

09-27-2004, 02:18 AM	#5
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Thanks guys, I'll try testing it. I have two trucks both with fuel guage problem. One stays at empty, the other at about a quarter. BTW not sure what you mean by disconnecting at the fuse block - i.e. remove a fuse, or does it just connect to a terminal on the block?

09-27-2004, 09:39 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	A brown wire plugs into the front of the fuse box, that is the one going to the fuel tank.



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