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Topic: Fuel Gauge Issue

in Forum: C3 Electrical


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Fuel Gauge Issue (1/4)
 7/4/23 5:10pm
RedMenace
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Joined: 7/4/2023
Posts: 10

 72 Coupe - My fuel gauge was acting wonky, so I cleaned the contacts at the sending unit, all the grounds in the rear lighting, and the ground at the rear frame. Now, it works great except for when I turn on the lights.

When the light switch is pulled to first or second position, the fuel gauge goes to Empty. 

I'm guessing a bad connection to the ground wire at the gauge, or a bad headlight switch ? Neither will be fun to get to, so which area would you inspect first ?

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Re: Fuel Gauge Issue (2/4)
 7/4/23 9:59pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20122

Well...since you mentioned the ground on the frame at the rear, I would start there. The grounds for the lights and fuel sender are in the same spot. Turning the lights on causes the lights to ground thru the fuel sender, which in turn would think the tank is empty. If you dis-connect the sender, the gauge should show full. As the sender float goes down, it increases the resistance, and moves the needle on the gauge down. I would suspect you disturbed the ground(s) there, and just need to re-visit, and clean. 



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Joel Adams
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Re: Fuel Gauge Issue (3/4)
 7/5/23 1:46pm
RedMenace
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Good call, thanks !

I ran a temporary ground from the sending unit to the frame and the gauge reads steady. So I have a little more ground cleaning to do, but you saved me from going into the dash for no reason !

Re: Fuel Gauge Issue (4/4)
 7/5/23 9:46pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20122

Good to hear! 👍



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Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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