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Username Post: 58 Impala fuel gauge problem        (Topic#351793)
Rockabilly 
Contributor
Posts: 121
Rockabilly
Loc: Germany
Reg: 09-05-07
06-29-18 04:35 PM - Post#2738541    

Hello!

When I connect the fuel gauge I get a maximum peak as soon as the case gets to ground.
The pointer does not strike, but is about full.
The gas tank is about 1/3 full.
I measure directly at the gas tank a resistance of about 25 ohms as well at the front of the plug.
As long as I only connect the plug to the gauge (12V + / ground 25 ohms) nothing happens.
As soon as the housing comes to ground, the pointer "jumps" to the right.
BTW, the fuel gauge is a retro part.
Is the problem known?
I mean this ohm value should be correct.
Actually, the pointer should land somewhere in the bottom of the display.

Thanks for your help







 




raycow 
Honored Member
Posts: 27764
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-29-18 11:55 PM - Post#2738565    
    In response to Rockabilly

Check the dash unit first, because it is easier. With 12V on the power terminal and the gauge case grounded, ground the terminal which connects to the tank unit wire. The pointer should go to empty or below. Then remove the ground from the tank terminal and the pointer should go to full or beyond.

Once you know that the dash unit is good, you will have to remove the tank unit and examine it for defects. The tank unit is supposed to have a resistance of approximately 30 ohms when full and approximately zero ohms when empty.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Rockabilly 
Contributor
Posts: 121
Rockabilly
Loc: Germany
Reg: 09-05-07
07-07-18 02:58 AM - Post#2739254    
    In response to raycow

Ray, sorry for the late answer and thank you for your advice.
I have checked the connections and the functions according to your description again and everything seems to be ok.

I will now test the fuel gauge in operation. If it shows halfway accurate I'm satisfied with that.



 
Bcrem 
"4th Year" Silver Supporting Member
Posts: 128
Bcrem
Reg: 11-10-12
07-14-18 06:27 PM - Post#2739987    
    In response to Rockabilly





 
Bcrem 
"4th Year" Silver Supporting Member
Posts: 128
Bcrem
Reg: 11-10-12
07-14-18 06:32 PM - Post#2739989    
    In response to Bcrem

I had a problem with my 59 fuel gauge you can see it on page 2 and look for bcrem under user name. The bottom line is after testing everything it was a bad sending unit. I think the last date was around 5/2/18 hope this helps



 




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