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#1 |
Registered User
Join Date: Jan 2004
Location: Arizona
Posts: 157
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Fuel Gauge Problem - Need Your Help
I have a 72 with a 3 gauge cluster. My fuel gauge is not working correctly. When the tank is full it shows 1/4 and empty when it is empty. It slowly creeps down from 1/4 to empty as I use gas so I know that a float is not stuck in the tank. The problem is likely electrical based on my not so experienced thoughts. Any ideas on where to start or how to resolve?
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72 C10 Burb 350 700R4 70 C20 LWB 350 Crate TH400 68 Chevelle |
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#2 |
Registered User
Join Date: Apr 2007
Location: Victoria, BC Canada
Posts: 48
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Re: Fuel Gauge Problem - Need Your Help
Are you sure your float isn't full of fuel because of a small leak ??
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#3 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Fuel Gauge Problem - Need Your Help
Yeah it's real easy to take it out and check the float and the operation of the unit,especially with an Ohm meter. When you disconnect the leed to the tank sender the fuel gauge should read past full IIRC. If it does then you either have a bad float,bad sender,or the float arm is not raising all the way up for some reason.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#4 |
Zappaphile!
Join Date: Apr 2007
Location: Los Banos, California
Posts: 228
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Re: Fuel Gauge Problem - Need Your Help
I just ordered the parts from a vendor here on the board (Thanks GMCPaul) to fix this exact problem.
Let me guess, you have not had the truck for some time or it was sitting on empty for some time... You filled it and "Look ma it works!". Then over time, it started to not get as close to full as you would have liked. then it started hanging out in the middle.. I am betting the float.. pull the wire behind the cab and see if it goes up to past full, then ground it. Full range of motion there for the gague? Its your time then. pull it and enjoy your leaky float. Get your repair hardware from them as well. Great people to deal with. Even over the phone
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1969 C20 LWB Camper Special - The Beater.. 1998 Cheyenne V6 - 4/6 Drop - For The Son |
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#5 |
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
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Re: Fuel Gauge Problem - Need Your Help
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Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
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#6 |
Rottenwood Garage Member
Join Date: May 2005
Location: Marietta, Georgia
Posts: 4,321
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Re: Fuel Gauge Problem - Need Your Help
I have replaced many sending units in these trucks and one thing I always do is remove the stock float...I think its brass and I replace it with a plastic one.
I have had 2 new ones...one that came from the board vendor you bought yours from that leaked when it was new!!!! It was no fault of the vendor......they just re-sell them....but Ill take sealed plastic over brazed together brass any day!!!!
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2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! It's not just a hobby..It's a LIFESTYLE!!! Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! |
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