1st gen 4Runner gas gauge bouncing

Feb 9, 2004
Cool Comfy AZ
Just like it says, my gas gauge "bounces" around the approximate actual level, unless the tank is completely full. Any ideas? I have an 86 4x4 and a 88, and neither of them do this. I replaced the sending unit about 20 years ago, I don't remember why now, with an OEM sender at the dealer. Gauge or sending unit or faulty wiring? Thanks for any help.

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