Fuel gauge problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

swells6367 · 12-17-2012, 08:53 PM

My fuel gauge was working fine and then it started going up way above full and when you shut the motor it settles about the 1/8th of a tank mark. if any one has seen this before I would sure appreciate some help thank you, s wells

**HIGHWAY BY THE SEA** · 12-17-2012, 10:22 PM

Have you checked the sending unit for continuity? How about the ground wire?

motornut · 12-18-2012, 10:36 AM

going over full .....check ground@ back or cluster

**hatzie** · 12-18-2012, 12:45 PM

Suddenly pegging the gauge at 3:00 is usually the frame to sender ring ground at the tank.

It could be a break in the sender wire too.

Early dual tanks could have a bad or unplugged dash switch.

Swed-Chevy · 12-19-2012, 09:19 AM

Hmm,must check my fuel gauge also,shows about 1/4 with full tank.

**hatzie** · 12-19-2012, 11:57 AM

Quote:

Originally Posted by Swed-Chevy

Hmm,must check my fuel gauge also,shows about 1/4 with full tank.

That's usually the at the gauge end...
If it's moving from E to 1/4 then the gauge or the calibration resistor are usually bad.
If it's not moving then check the power and ground connections to the cluster plug, the plastic printed circuit, and the connection from the printed circuit to the spring clips.

I keep intending to do a writeup on testing the gauges. Maybe over my Christmas holiday... Youtube sounds easier.

PAPA KENT · 02-11-2013, 11:42 AM

Quote:

Originally Posted by hatzie

That's usually the at the gauge end...
If it's moving from E to 1/4 then the gauge or the calibration resistor are usually bad.
If it's not moving then check the power and ground connections to the cluster plug, the plastic printed circuit, and the connection from the printed circuit to the spring clips.

I keep intending to do a writeup on testing the gauges. Maybe over my Christmas holiday... Youtube sounds easier.

i had purchased a 83 with a single tank over the weekend and the gauge was reading 1/4 tank so i replaced the gauge and it's back to normal.

thanks for all the information guys.

kent.

swells6367 · 02-12-2013, 11:42 AM

my gauge and sending unit are shot I am going to put an after market gauge in thanks for all the help

Swed-Chevy · 12-20-2012, 03:39 AM

Thanx for info,should check that.(when it,s warmer outside)

Swed-Chevy · 03-01-2013, 11:28 AM

Quote:

Originally Posted by Swed-Chevy

Thanx for info,should check that.(when it,s warmer outside)

Have replaced the fuel gauge now and it looks better

swells6367 · 12-21-2012, 10:59 PM

my ground is OK at the tank but the power wire is 5 different wires.I patched it up for a temp fix but I am going to cut the bundles and run a new wire. just patching the power wire helped it reads correctly now

12-17-2012, 08:53 PM	#1
swells6367 Registered User Join Date: Nov 2012 Location: St George utah Posts: 18	Fuel gauge problems My fuel gauge was working fine and then it started going up way above full and when you shut the motor it settles about the 1/8th of a tank mark. if any one has seen this before I would sure appreciate some help thank you, s wells

12-17-2012, 10:22 PM	#2
HIGHWAY BY THE SEA Senior Member Join Date: Nov 2012 Location: BY THE CAROLINA SEA Posts: 922	Re: Fuel gauge problems Have you checked the sending unit for continuity? How about the ground wire? __________________ FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion

12-18-2012, 10:36 AM	#3
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Fuel gauge problems going over full .....check ground@ back or cluster __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

12-18-2012, 12:45 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Fuel gauge problems Suddenly pegging the gauge at 3:00 is usually the frame to sender ring ground at the tank. It could be a break in the sender wire too. Early dual tanks could have a bad or unplugged dash switch. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

12-19-2012, 09:19 AM	#5
Swed-Chevy Registered User Join Date: Feb 2008 Location: Sweden Posts: 114	Re: Fuel gauge problems Hmm,must check my fuel gauge also,shows about 1/4 with full tank. __________________ Chevrolet Cheyenne K2500HD 1992.350tbi.4L80E. GMC Sierra Custom C1500 1983. Oldsmobile Dynamic 88 -65. Volvo V70 -02 and BMW 523i T -99. Harley FXDF -08 and Harley FXDB -10. Honda Dirtbike Dominator -97 and a couple of tractors.

02-12-2013, 11:42 AM	#8
swells6367 Registered User Join Date: Nov 2012 Location: St George utah Posts: 18	Re: Fuel gauge problems my gauge and sending unit are shot I am going to put an after market gauge in thanks for all the help __________________ Scott wells 1973 k10 81 7.2l power-train

12-20-2012, 03:39 AM	#9
Swed-Chevy Registered User Join Date: Feb 2008 Location: Sweden Posts: 114	Re: Fuel gauge problems Thanx for info,should check that.(when it,s warmer outside) __________________ Chevrolet Cheyenne K2500HD 1992.350tbi.4L80E. GMC Sierra Custom C1500 1983. Oldsmobile Dynamic 88 -65. Volvo V70 -02 and BMW 523i T -99. Harley FXDF -08 and Harley FXDB -10. Honda Dirtbike Dominator -97 and a couple of tractors.

12-21-2012, 10:59 PM	#11
swells6367 Registered User Join Date: Nov 2012 Location: St George utah Posts: 18	Re: Fuel gauge problems my ground is OK at the tank but the power wire is 5 different wires.I patched it up for a temp fix but I am going to cut the bundles and run a new wire. just patching the power wire helped it reads correctly now __________________ Scott wells 1973 k10 81 7.2l power-train



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