Fuel Gauge Always Reads Full
#1
Junior Member
Thread Starter
Join Date: May 2011
Location: Houston, Texas
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1987 Red GTA Trans Am
Engine: 350 TPI
Fuel Gauge Always Reads Full
I have an 87' Trans Am 350 TPI and no matter how full the gas tank is the digital dash always says I have a full tank. I'm assuming the sending unit is bad and if theres an easy way to change that? but any other input on the gauge is appreciated. Thanks!
#3
Senior Member
Join Date: Jan 2006
Location: League City, TX
Posts: 720
Likes: 0
Received 1 Like
on
1 Post
Car: 90 Formula -- tot resto in progress
Engine: 350
Transmission: 700R4 w/ 2500 stall, by Owen @ ARD
Axle/Gears: 3.23 posi disc
Re: Fuel Gauge Always Reads Full
Cutting a trap door is one solution to getting to the fuel-pump/float level unit.
The other is drop the tank. Like a religion, each has its apostles & disciples.
Caveat Emptor.
I would suggest an easier alternative is to first verify the lack of signal into
the instrument panel. There is a three wire harness to the fuel tank,
that can be disconnected from the body panel. The three wires are ground
(black), switched power in (gray), and fuel level out (purple). The fuel level
varies resistance from 0-90 ohms. Measure resistance between purple &
black, when you estimate approx. half full. If you get a reading anywhere
near 45 ohms, the level sender is functioning, and the problem is with
the gauge unit itself -- unusual, but not impossible. (Go ahead, ask me
how I know this. )
Good luck, & keep us posted.
The other is drop the tank. Like a religion, each has its apostles & disciples.
Caveat Emptor.
I would suggest an easier alternative is to first verify the lack of signal into
the instrument panel. There is a three wire harness to the fuel tank,
that can be disconnected from the body panel. The three wires are ground
(black), switched power in (gray), and fuel level out (purple). The fuel level
varies resistance from 0-90 ohms. Measure resistance between purple &
black, when you estimate approx. half full. If you get a reading anywhere
near 45 ohms, the level sender is functioning, and the problem is with
the gauge unit itself -- unusual, but not impossible. (Go ahead, ask me
how I know this. )
Good luck, & keep us posted.
Thread
Thread Starter
Forum
Replies
Last Post
Ghettobird52
Tech / General Engine
15
12-29-2023 08:23 AM