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#1
10-20-2014, 03:03 PM
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W201 Jumpy fuel gauge - common cause?
The fuel gauge in my daily driver (a '93 190E with transplanted diesel drivetrain) is very "jumpy", twitching around almost as soon as the needle moves off the full mark. It will sometimes jump between 1/4 and 3/4 tankful.
Is there a common cause for this condition? I'm tempted to think that the problem is in the fuel tank sender as opposed to the dash, but I'm certainly open for suggestions. Thanks, Steve.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner 
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#2
10-20-2014, 05:21 PM
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Ground.
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO
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#3
10-20-2014, 05:38 PM
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It is the fuel sender. The contacts between the float and wire is flaky. You can access it from the trunk but you need a 46mm socket. I normally open it up and soak it in engine cleaning agent and brush off all the crap inside the tube. The wire is delicate so need to be careful. Good luck.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.  W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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#4
10-20-2014, 07:31 PM
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Quote:
I usually just use a channel lock to remove the sender. It's not in there very tight. All you need to remove to get access is the felt fabric at the back of the trunk. There are plastic snaps along the sides and the top hangs on hooks attached to the tank itself. Once the fabric is off, the sender will be right in front of you. Pull it out of the tank slowly: it's filled with fuel, and it takes time to drain. VERRRY carefully pull the aluminum covering off. The sender is a float that rides between two hair thin wires. The wires get covered with varnish andn need to be cleaned with a qtip, solvent, and a light hand. Or just install a new sender.
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