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#1 |
Registered User
Join Date: Oct 2012
Location: St Charles Illinois
Posts: 26
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Fuel Gauge Problems, need some help
Hello guys,
I have dual gas tanks. Here is my situation Full to the rim, the Right hand tank when selected reads just at about HALF tank. Then it reads going down from there. Reads about the dash after empty at half tank, and really doenst go down farther from there, Ive gone to about 16/20 gallons used, but I dont dare go further to run risk of running a diesel dry. Now the left tank (drivers side) reads about a half inch past the Full line , but doesnt move at all I have a feeling the left tank has a ground issue with the sender, and I feel the sender or float is bad on the right. Am I close? or has someone experienced this before and knows better? I want to tackle 1 tank at a time, I can atleast drive it with one tank off. But want to have parts ready -Sterling |
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#2 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Fuel Gauge Problems, need some help
over full sender off
E short inbetween ...ground I'd work over the switch/grounds
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#3 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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Re: Fuel Gauge Problems, need some help
This assumes this is the 1982 truck you've posted about... 1973-1980 are different.
It's probably the senders but... Test the gauge first. It's easy to test and easy to change. You'll need
Follow these instructions from the Corvette guys to build a cheap Potentiometer fuel gauge tester... Note: Our 73-91 gauges are 0-90ohms like the C3 not 0-30ohms like the C1. http://www.lbfun.com/warehouse/tech_...lGaugeTech.pdf
If the gauge reads wonky check the wire from the firewall bulkhead plug under the brake booster to the valve plug for damage. Replace the gauge if the wire checks out. You can check the senders at Full without removing a tank as follows.
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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...
And please let us know if and how your repairs were successful. Last edited by hatzie; 02-03-2013 at 01:14 PM. Reason: Correcting my poor grammar. |
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#4 |
Registered User
Join Date: Oct 2012
Location: St Charles Illinois
Posts: 26
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Re: Fuel Gauge Problems, need some help
Thanks Hatzie, Ill drive my truck over to our heated warehouse (its around 0 F outside) and give those tests a try. Updates to follow
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