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Old 11-24-2002, 09:55 AM
Registered User
Join Date: Mar 2002
Posts: 56
Jumping fuel indicator

Lately, on my '92 300E (with 150,000 miles) the fuel indicator jumps around, usually dives toward empty then back up, as the fuel level gets to around 1/4 or so. Any ideas as to what's going on and what I can do to fix this?
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Old 11-24-2002, 11:17 AM
goldstone's Avatar
W126 Lover
Join Date: Oct 2002
Location: Dutchess County, New York
Posts: 154
Lightbulb Fuel Gauge Sending Unit

Do a search on "fuel sending unit". There's lots of GREAT info in this forum on servicing and/or replacing this common source of problems. (I'd be willing to bet that this is the source of your dancing fuel gauge.)

My confidence comes from the fact that I just serviced and completely repaired the sending unit on my own '89 420SEL a few weeks ago. I suspect that if you're reasonably handy, use obvious caution around the gasoline, and follow the instructions contained on this forum, cleaning your sending unit will solve your problem.

Additionally, you might try adding some Techron(TM) to the fuel tank to help clean the system. Also, don't forget to change your fuel filter periodically.

Hope this helps... Good luck!

1991 560SEL-Euro (165,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)
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