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Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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3/17/17 10:52am - Original Message: 'fuel gauge'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
My 1969 fuel gauge has stopped working. The needle stays on full and does not move.  The gauge or sending unit bad?  Any suggestions. Thanks
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3/17/17 9:42pm - Reply: 'Re: fuel gauge'
Adams' Apple Lifetime 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: 19459
First do a little test. At the fuel tank, there is a brown/tan wire on the sending unit. Take that connector loose, and with the key on, engine off, ground it(use a short piece of wire, or a small screwdriver as a jumper) to the frame. If the fuel gauge goes to "Empty", the wiring, and the gauge itself are good, and your problem is with the sending unit.
 If it does not go to Empty, then you have either a break in the wiring from the sender to the gauge, or there is an issue with the gauge itself. Thumbs Up

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3/19/17 5:11am - Reply: 'Re: fuel gauge'
Grahamred70
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, - United Kingdom

Vette(s):
1970 convertible in red 350

Joined: 10/6/2015
Posts: 82
Correct me if I'm wrong but I think you've got it back to front, if the sensor lead is grounded it will go to full not empty. If it reads full all the time then it's either a short in the sensor lead or in the tank sender unit.
If you disconnect the lead at the sender then switch on the ignition the gauge should drop to empty, if it does its the tank sender if it stays full it could be the gauge or the sensor lead, if you check resistance of the lead to the chassis and it's very low you'll need to get to the back of the gauge and disconnect it there and check again to narrow down where the problem lies.
Graham
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3/24/17 1:52pm - Reply: 'Re: fuel gauge'
persico Gold Member
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Long Valley, NJ - USA

Vette(s):
1972 454 Coupe, 4 speed, Targa Blue with blue interior, luggage rack

Joined: 3/21/2007
Posts: 255
With apologies to our sponsors, ,Wilcox has a very good diagnostic procedure on their site!

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Mario
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3/31/17 11:13am - Reply: 'Re: fuel gauge'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
Thanks I will look at the Wilcox site and try the tests that were mentioned by the other members  
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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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