Gas gauge problem
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 60
Likes: 0
Gas gauge problem
How do I go opon fixing a gas gauge which gives incorrect reading like sometimes it will read quarter tank and I'll run out of gas ,
I need help it's winter and it's Michigan so this is very inconvenient
I need help it's winter and it's Michigan so this is very inconvenient
Junior Member
Joined: Oct 2009
Posts: 66
Likes: 0
Re: Gas gauge problem
you need to give more info on the vehicle. newer(probably anything fuel injected) cars have a floater attached to the fuel pump in the gas tank. that is what tells the needle where to be on the gauge.
Senior Member
iTrader: (1)
Joined: Jan 2008
Posts: 618
Likes: 12
From: Destin, Florida
Car: 91 Trans Am Convertible
Engine: LB9 5.0 TPI
Transmission: 5 SPD
Axle/Gears: Posi Rear
Re: Gas gauge problem
A quick electrical check should be able to tell you if the problem is the guage or the sending unit in the tank. I don't know the specs but I would have it checked before pulling the tank to change the sender. Maybe another member can tell you how to check them.
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Fuel Rules
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can throw together a quick little panel like this one to make it convenient.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain
.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can throw together a quick little panel like this one to make it convenient.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain.
Supreme Member
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Fuel Rules
What NINA said. The gauge should read full at 90ohms, empty at 0ohms. The 0-100 ohm pot may be hard to find. Radio Shack likely wont have it. You'll need to go to Fry's or an electronics specialty store.
Hint: Use an ohmmeter to calibrate your home made test box before you start testing. This way you'll know where 90 and 0 ohms are
Hint: Use an ohmmeter to calibrate your home made test box before you start testing. This way you'll know where 90 and 0 ohms are
Thread
Thread Starter
Forum
Replies
Last Post
Ghettobird52
Tech / General Engine
16
Jul 5, 2024 11:18 PM
