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Username Post: Gas gauge reads half when full        (Topic#364062)
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-21-21 08:22 AM - Post#2812536    

I have a 58 Bel Air. I fill the tank but the gauge only goes to half. It goes down with use as normal, mpg about 12 (1973 350 V8).Any ideas guys?



 


acardon 
Ultra Senior Member
Posts: 11464

Loc: DFW TEXAS
Reg: 03-25-05
01-21-21 09:51 AM - Post#2812545    
    In response to jacko77

A float leak can cause some fuel to get in the float and lower the level of the float.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-21-21 10:48 AM - Post#2812552    
    In response to acardon

Thanks Don. It has been stood for some time. Gas was cleared out, electrics seem OK (I'm told).



 
GreatNorthWoods 
"6th Year" Silver Supporting Member
Posts: 1218
GreatNorthWoods
Age: 78
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
01-22-21 05:42 AM - Post#2812609    
    In response to jacko77

There are only a few things it can be. Float is bad, float is hitting something in tank causing it to stop halfway, wrong sending unit, or float arm does not conform to tank specs (float arm too long or not the correct bend). Gauge should be good since it moves.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, EZ Wire, Vintage Air, Ididit column, Cruise/Tilt, PS, 59 Corvette Steering Wheel, 4-Wheel Discs, Posies Rear Springs, Coker Radials, Nova 10-bolt, Mustang II, NCA Continental Kit.


 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-22-21 04:47 PM - Post#2812659    
    In response to GreatNorthWoods

Thanks Vern. I'll start with the simplest. The car originally had an inline six and was fitted with a later V8. I don't think that will make a difference. I keep hoping that when I fill up, it will bounce back to full. Wishful thinking!



 
Chair City 
Contributor
Posts: 510

Loc: Thomasville, NC USA
Reg: 01-24-04
01-23-21 08:10 AM - Post#2812726    
    In response to jacko77

You can quickly verify if the gage is good by disconnecting the wire from the sending unit in tank then with the ign. switch on the gage should read full. Grounding the wire should result in the gage reading empty

1960 Impala Spt. Cpe. Now in my son's garage


 
JayChicago 
"11th Year" Silver Supporting Member
Posts: 428
JayChicago
Loc: Chicago
Reg: 01-03-13
01-23-21 08:41 AM - Post#2812730    
    In response to jacko77

Good advice from Chair City. That's the simplest first step. If the gauge responds as he said, eliminates the gauge (or low voltage to it) as the problem. Then you can have confidence the problem is with the in-tank sender.

You are correct, different engine has no effect on the fuel gauge system.



 
GreatNorthWoods 
"6th Year" Silver Supporting Member
Posts: 1218
GreatNorthWoods
Age: 78
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
01-24-21 05:03 AM - Post#2812800    
    In response to Chair City

Won't hurt to try it but if the gauge moves at all, then it is okay. I've never seen a gauge move halfway that was bad. The problem is likely somewhere else.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, EZ Wire, Vintage Air, Ididit column, Cruise/Tilt, PS, 59 Corvette Steering Wheel, 4-Wheel Discs, Posies Rear Springs, Coker Radials, Nova 10-bolt, Mustang II, NCA Continental Kit.


 
larrybrowningmauldin 
Contributor
Posts: 437
larrybrowningmauldin
Loc: New Braunfels,TX
Reg: 08-16-05
01-24-21 06:58 AM - Post#2812807    
    In response to GreatNorthWoods

I have had a similar problem with a 55 and 57. The solution was a new Ford float. I do not recall the part number for the metal float that had a good weld on the seams. Perhaps some other member will remember the part number. Larry



 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-24-21 02:58 PM - Post#2812832    
    In response to Chair City

Thanks for this.



 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-24-21 02:59 PM - Post#2812833    
    In response to JayChicago

Thank you.



 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-24-21 02:59 PM - Post#2812834    
    In response to GreatNorthWoods

thanks.



 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
01-24-21 03:00 PM - Post#2812835    
    In response to larrybrowningmauldin

Thanks Larry.



 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
01-27-21 06:56 AM - Post#2813067    
    In response to jacko77

Yes I do know the p/n for that float.
It is (coaz-9202-b)



 
jacko77 
Newbie
Posts: 8

Reg: 10-31-20
02-08-21 02:18 PM - Post#2813886    
    In response to killerkjn

Thank you for this!



 


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