gas gauge!

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Aug 21, 2011 | 05:27 PM

DeuceBag

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Joined: Jul 2011

Posts: 20

gas gauge!

88 chev 3/4 ton, gas gauge shows full, all the time. Every now and then it drops to empty but then jumps back to full again. I have to do a fuel pump soon so I want to diagnose this and fix it at the same time

Aug 21, 2011 | 05:44 PM

ghostpopi

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Joined: Mar 2011

Posts: 37

sending unit

Aug 21, 2011 | 10:32 PM

DeuceBag

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Posts: 20

Where is that located?

Aug 22, 2011 | 06:51 AM

GMCSierraFan

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Joined: Feb 2009

Posts: 1,558

From: Midwest

it's all one peice with the fuel pump. Replacing the pump will fix your problem

Aug 22, 2011 | 11:02 AM

DeuceBag

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Joined: Jul 2011

Posts: 20

Thanks a lot

Aug 26, 2011 | 05:56 AM

DeuceBag

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Posts: 20

I have the fuel pump and tank etc apart and what I think the sending unit is looks pretty screwed, and a new one didn't come with the new pump...

Aug 26, 2011 | 06:07 AM

tomwalshco

Junior Member

Joined: Aug 2011

Posts: 4

You can buy the pumps separately or the whole assembly. Sending unit is about as complicated as a toilet tank float. Float and a resistor. I'll bet the float is not moving freely. Gummed up.

Aug 26, 2011 | 03:57 PM

cubpak89

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Joined: Feb 2011

Posts: 879

From: iowa

it is probebly gummed up and stuff or there may be a ground wire loose or soemthing ground wire can cause the same effect

Aug 28, 2011 | 06:51 PM

DeuceBag

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Joined: Jul 2011

Posts: 20

the baffle in my tank wasnt mounted anymore, it must have smashed off the sending unit because I found it in the tank. replaced tank and fuel pump assy, ran good. thanks guys