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Old 11-26-2000, 11:49 PM
300EVIL's Avatar
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Join Date: Apr 2000
Location: Lake Geneva, WI.
Posts: 1,676
my gas guage seems to be slightly flickering everyonce in a while what could cause this problem?

87 300E

87 420SEL

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Old 11-26-2000, 11:58 PM
Robert W. Roe's Avatar
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Join Date: May 1999
Location: Lehigh Valley PA
Posts: 1,330
My guage "flickers" when my tank gets near 1/4 full. I understand that this is caused by a dirty fuel sender contact, but there is a separate switch to activate the "R" light. When my "R" light goes on, I'm down to a little over a gallon left in the tank, so I know it's time to fill up at that time. I keep a spreadsheet of my fuel consumption, so I have a feel for how long I can go on a tank, and I seldom am more than 20 miles from a station that sells diesel. Hope this helps,

Robert W. Roe
1984 300SD 173K mi
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Old 12-02-2000, 12:59 PM
Posts: n/a
I had the same flickering problem in my 92 500E. I recently added a bottle of STP "Complete Fuel System Cleaner" to the gas and the flickering seems to have stopped. I don't know if it is truly fixed but a couple of months has gone by without me noticing the flickering. Might be worth a try before pulling the sender.

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Old 12-03-2000, 11:22 PM
Mr. BILL's Avatar
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Join Date: Aug 2000
Location: Austin, TX
Posts: 576
You have a dirty fuel sending unit. To access it, remove the first aid kit box,(a couple of screws in the bottom). Then, disconnect the plug the attatches to the sending unit. Take a large socket, I think it's 44mm and unscrew the unit.

SLOWLY, withdraw the sending unit allowing fuel to drain completely. A couple of shop rags are a good idea to protect your seats.

Cleaning takes alot of care. there are some delicate wires that the float slides up and down on. There is a description of this procedure @ But their removal procedure that called for removing the seats didn't prove to be correct for a 123 or a 126.

Good luck,


91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)
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