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fuel sender read full, when empty, help

Wolverine

Jr. Member
Joined
Dec 26, 2017
Messages
100
Hombres:
So, I replaced the aux fuel sender and that unit works/reads fine. Now working on the main. Tank read empty, when actually full, so I check the wiring and... previous owner had the wiring flipped. I rewired and tank read full, and it, was so I thought 'fixed'. However the reading stayed full until I ran the tank dry. I'll take the sender out and check the float to ensure it isn't stuck (rusted). Any other ideas?
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
43,180
Hmm, interesting one you got there Wolverine.
What happens if you just leave the sending unit disconnected? If it still pegs to full, then the issue is with the wiring or the switch on the dash.
Since the gauge works fine on the aux tank, then you know that at least the wiring is fine after the switch and the gauge is also fine.

Paul
 
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OP
Wolverine

Wolverine

Jr. Member
Joined
Dec 26, 2017
Messages
100
Paul:
If I disconnect, unit goes to empty. Fairly certain stock tank. I will take out sender tomorrow, and 'see' if the float is stuck.
 

SteveL

Huge chevy guy
Joined
Jun 24, 2001
Messages
11,202
I remember having an issue like that years ago. Is there a ground off the sender or tank you need to attatch to the frame/crossmember.
 
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OP
Wolverine

Wolverine

Jr. Member
Joined
Dec 26, 2017
Messages
100
Steve:
Yes, there is a ground, covered in thick undercoat. I will rewire/route that and test before I take the sending unit out. Thanks.
 

Viperwolf1

Contributor
electron whisperer
Joined
Aug 23, 2007
Messages
24,038
Are you sure you don't have the wiring flipped at the tank? Orange wire to ground will make the gauge read full.
 
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