in a 1991 560SEL?

My gas gauge is flakey! Is it necessary to drop the tank?

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1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)

On my '85 W126, I removed the rear seat back. The sender is on the driver's side on top of the tank.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma

If you have the power rear seat, all that has to come out, its under the lf rear seat back just below the shelf ledge, 46mm socket.

I've had success taking the units apart and cleaning them out in the past.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Don't be too disappointed if you still have a flakey gauge after replacing the sending unit.

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2012 E350
2006 Callaway SC560

Whwn I bought my 85 380SE the gauge would jump all over the place especially when nearing 1/4 to R level. Two treatments of Chevron Techron solved the problem. Gauge works perfectly.

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)

You are lucky. One of my 124s has that problem, one doesn't. I swapped the sending units. It made no difference at all to either car.

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2012 E350
2006 Callaway SC560

I think I posted something on the DIY forum. For my 1991 300d, it was a breeze to repair. The problem was that rust gets on the shaft from the former owners never filling it up all the way, or in my case, the car sat for months on end without much fuel in it, and so it rusted.

Take it out, hit it with a dremel or Rotozip, with a round sanding bit, to sand it down where needed, put it back. Read on how to do it first, if you don't see anything, e-mail me directly and I'll send info.

jeff
1991 300d, 99k