Question: C5500 TOPKICK FUEL GAUGE ISSUE - Diesel Place : Chevrolet and GMC Diesel Truck Forums
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Electrical Discuss anything related to OEM & aftermarket electrical devices including: stereos, speakers, video, batteries, starters, the body control module, lighting, etc. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 08-26-2019, 11:18 AM   #1 (permalink)
Sparkplug Hunter
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I have a 2003 C5500 with a LB7 Duramax. The fuel gauge works intermittently, then quits. The cluster was rebuilt 5 years ago. When the gauge goes out (reads empty with full tanks), the rear transfer pump quits working and the truck will only use the front tank. We have ran a new wire from the body control module, replaced the transfer pump, replaced both sending units, rebuilt the cluster, cleaned or added more grounds, replace the 3 batteries, and took it to multiple repair shops; only for the truck to sit outside for days. Nobody wants to put the time into it. We even installed an aftermarket fuel gauge, but that always says "FULL" while the stock gauge reads "EMPTY". When I hook my scanner up and "test" the gauges (make them sweep on command) the fuel gauge starts working, as does the transfer pump. So for now we can get 200 or so miles between fill ups. When the gauge quits working, we can only get about 100 miles before running out of fuel. This is very annoying, so can anyone help me out?

2003 C5500 with a LB7 Duramax

Last edited by OkDually; 08-26-2019 at 11:27 AM. Reason: prefix/sig
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Old 08-26-2019, 11:28 AM   #2 (permalink)
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Welcome to DieselPlace
I moved your post over to "Electrical" for better responses to your issue

1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
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GM-5 Turbocharger
4.10 gear ratio
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Old 08-27-2019, 10:29 AM   #3 (permalink)
Ron Nielson
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Call a dealership and ask them if your IP need to be re-programed. Mly 2008 manual carries references to this after IP cluster replacement. Not at all sure how your 2003 model works.
Ron Nielson

2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers
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