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#1 |
New Member
![]() Join Date: Sep 2004
Location: seattle
Posts: 4
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New square body Owner Questions
Dual tank 78 scottsdale, seems like the gas gauge is not working properly. I put gas in and it moves some and then goes down like on empty. What should i look at first . Any suggestions would be appreciated. Will have more questions as i go through the truck and discover any more small issues. I'm general truck is in great shape . Thank you
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castiron9 |
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#2 |
Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 512
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Re: New square body Owner Questions
This could be similar to the issue I had. Check out the video.
https://www.youtube.com/watch?v=HuGfmgNPTS0
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1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice |
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#3 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,555
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Re: New square body Owner Questions
Same behavior on both tanks?
If both do the same, then suspect the gauge or cluster wiring. If one works proper and one weird, suspect switch, sender or wires between switch and sender. |
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#4 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,957
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Re: New square body Owner Questions
Empty with more than 7 gallons of fuel in the tank usually means you have a shorted sender wire or bad sender.
If you have less than 4-5 gallons in the tank I would not expect the needle to move off empty. Dead short to ground on the signal wire will drive the needle to E. 90Ω resistance to ground on the sender wire will drive the needle to F. If you unplug the sender or break the tank ground wire the needle will go to the 3:00 position.
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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. |
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