Fuel Guage issue--99 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-22-2004, 03:03 PM   #1
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Default Fuel Guage issue--99

My 99 Bonneville has an eratic fuel guage issue when the tank is completely full. It will jump to empty and sit there for about 45 seconds, then return to full. I searched the tech info posts regarding the issue on the 92-93 SSE and SSEi and my issue is completely the same. Is this a known issue on the SE model? If so, is the fix the same with the 2k ohm resistor?
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Old 03-23-2004, 08:35 AM   #2
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Any one have any thoughts on this?!?!?
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Old 03-23-2004, 09:05 AM   #3
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sounds to me like a ground issue
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Old 03-23-2004, 10:19 AM   #4
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Disconnect the fuel tank unit connector.
Use a multimeter on ohm scale (resistance)
Place leads on A and D connections.
Turn the ignition switch to the RUN position.
Tester resistance dials to 40 ohms (EMPTY).
Tester resistance dials to 248 ohms (FULL).

If this only happens when full and no other time it is not a wiring issue but a sender one. There is no easy way to correct this and does require droping the fuel tank to replace.
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