Gas gauge does not work?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
It sounds to me as if the gauge is missing power or not working.
A gauge with no ohms input will read full,
A gauge with a grounded ohms wire will read empty,
It could also be a ground issue at the sending unit...
Go to the sending unit and with the key on remove the ohms wire.. see if the gauge goes to full. Then ground out the ohms wire and see if it goes to empty. If if gauge functions to full and empty you have a sending unit issue.
A gauge with no ohms input will read full,
A gauge with a grounded ohms wire will read empty,
It could also be a ground issue at the sending unit...
Go to the sending unit and with the key on remove the ohms wire.. see if the gauge goes to full. Then ground out the ohms wire and see if it goes to empty. If if gauge functions to full and empty you have a sending unit issue.
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Team Owner
Joined: Oct 2000
Posts: 38,897
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From: Washington Michigan
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Hum.. you pulled the tan wire and it went to full that is good.. Now replace the fuse and ground out the tan wire.. see if it goes to empty.
If it goes to empty then make sure the ground on the sending unit is good...
Then if you have a good idea about how much fuel is in the car... take an ohms reading on the sending unit and see what it says.
A full tank should have 90 ohms. 67.50 would be 3/4, and zero is empty. If the tank is full and you have an ohms reading of 67 or so.. then you have a problem in the sending unit.
Then post back..
If it goes to empty then make sure the ground on the sending unit is good...
Then if you have a good idea about how much fuel is in the car... take an ohms reading on the sending unit and see what it says.
A full tank should have 90 ohms. 67.50 would be 3/4, and zero is empty. If the tank is full and you have an ohms reading of 67 or so.. then you have a problem in the sending unit.
Then post back..
Last edited by Willcox Corvette; Aug 21, 2011 at 07:52 PM.
Thread Starter
Racer
Joined: Jul 2011
Posts: 253
Likes: 4
When I pulled the tan wire, went from 3/4Full(where it stays now, with everthing plugged in), to 1/2 tank. Then I grounded the tan wire, and gauge went slowly to full. Nothing I did made the gauge go to empty. Any suggestion/ Going to read the link above.
I'll be calling you tomm.!
Thanks.
I'll be calling you tomm.!
Thanks.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Ok.. not to to worry..
Did you take a reading off the sending unit to see what ohms it was putting out in relation to how much fuel is in the car?
I have a tester that I can hook a gauge to and simulate issues... so we'll figure this out. I won't be in the office tomorrow.. I'll be in the shop.. so send an email to Willcoxcustomerservice@willcoxcorvette.c om. That's the best way to reach me.
The link John posted is very.. very helpful too...
Did you take a reading off the sending unit to see what ohms it was putting out in relation to how much fuel is in the car?
I have a tester that I can hook a gauge to and simulate issues... so we'll figure this out. I won't be in the office tomorrow.. I'll be in the shop.. so send an email to Willcoxcustomerservice@willcoxcorvette.c om. That's the best way to reach me.
The link John posted is very.. very helpful too...
Instructor
Joined: Sep 2001
Posts: 112
Likes: 1
From: San Diego/Pontiac CA/MI
Me Too
I don't mean to take the attention off the initial poster but I have a problem with my fuel gauge too. It never goes above 1/4 of a tank. I just bought this 1964 red Vette and it is just like my first new car. I remember that I had the same problem 47 years ago but then it was under warranty so I don't know what the dealer did to fix it. Do any of you folks know what causes this problem?
Burning Brakes
Joined: Jun 2007
Posts: 945
Likes: 8
From: Miami FL
I've been living with a gauge that never reads more than 3/4 full. 
This thread has motivated me to crawl under there and do my own checking. Thanks for the push… 
Joe
Sounds like you’re on the right thread to diagnose your problem. Between what’s posted here and John’s link, you should have enough to begin checking.
This thread has motivated me to crawl under there and do my own checking. Thanks for the push… Joe
Sounds like you’re on the right thread to diagnose your problem. Between what’s posted here and John’s link, you should have enough to begin checking.
I don't mean to take the attention off the initial poster but I have a problem with my fuel gauge too. It never goes above 1/4 of a tank. I just bought this 1964 red Vette and it is just like my first new car. I remember that I had the same problem 47 years ago but then it was under warranty so I don't know what the dealer did to fix it. Do any of you folks know what causes this problem?