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Author Topic: Fuel Gauge Stuck at 1/4 Tank  (Read 4508 times)

mfriedman

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Fuel Gauge Stuck at 1/4 Tank
« on: May 01, 2011, 16:33:19 »
On my 1965 230SL, the fuel guage operates from off (empty) to 1/4 tank even though there is a full tank of fuel and has a brand new fuel sending unit. Any comments would be appreciated.
« Last Edit: May 13, 2011, 21:58:30 by 280SL71 »
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ja17

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Re: Fuel Guage Stuck at 1/4 Tank
« Reply #1 on: May 02, 2011, 06:18:10 »
There are early and late style sending units which will not interchange unless the fuel gauge is changed also.  Did you install a cylindrical unit or a "lever and float" type?
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

mfriedman

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Re: Fuel Guage Stuck at 1/4 Tank
« Reply #2 on: May 02, 2011, 18:31:15 »
I installed the round aluminum newer type.
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al_lieffring

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Re: Fuel Guage Stuck at 1/4 Tank
« Reply #3 on: May 05, 2011, 15:10:47 »
There is a shipping pin that holds the float in place that needs to be removed before installation of the new sensor.
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pablo_o2

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Re: Fuel Guage Stuck at 1/4 Tank
« Reply #4 on: May 13, 2011, 17:24:50 »
did you try to change the wiring I noticed when I was experimenting with the wires somehow when they were switched from place the gauge only went to 1/4. Also I read in the technical pages that gauge and sender unit are not interchangeable with newer types. If you changed to the newer tube unit maybe that can cause a conflict also.
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