Gauge doesn't read full?
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Joined: Sep 2019
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Gauge doesn't read full?
Hey, guys. I have an 87 Iroc z 5.7 TPI. When I fill up the tank the gauge reads 3/4, it never gets to full. I switched out the sending unit, pump, and tank and I still have the same issue. I believe I tested the gauge correctly and it checked out. What else could cause this? Thanks.
Joined: Oct 2001
Posts: 12,213
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Gauge doesn't read full?
The needle could be off or the contacts on the back of the gauge to the printed circuit could be corroded. Had it happen to a couple of my cars, I pulled the cluster and cleaned all the contacts from main harness and gauges to printed circuit. It all worked like a champ after.
Supreme Member
Joined: Jan 2000
Posts: 3,178
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From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Gauge doesn't read full?
FSM pages attached. Essentially, it's a process of elimination. If it's not the gauge, it's the sender; provided the wiring isn't hacked.
The instructions call for the use of a resistance box to check the gauge. Most people don't have a resistance box - you should be able to figure out a work around.
The instructions call for the use of a resistance box to check the gauge. Most people don't have a resistance box - you should be able to figure out a work around.
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