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#1
06-20-2007, 02:05 PM
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Removing the Fuel Sender Unit
Hey All - first post here but am always browsing the forums, really appreciate the insights...
My question is regarding removing the fuel sender in an '85 123. I tried the channel lock solution, but there was no way that nut was going to budge. For those of you who were able to remove it, was it this difficult? Any suggestions? I live in a pretty hot area, so i'm thinking that everything sort of started to fuse together (and the fact that it probably hasn't been removed in 22 years doesn't help). Thanks!!! 
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#2
06-20-2007, 03:45 PM
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Use BIGGER channel locks
 . If its really too tight for something "adjustable" (cheap) You might have too spring for the proper size wrench or socket, I haven't failed too remove any with channel locks, just got lucky maybe.Be careful when lifting the unit out as diesel "pees" out of a little hole for a long time 
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#3
06-20-2007, 03:50 PM
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I removed the bulkhead in the trunk so I could get more of a swing to remove it.. could try a pipe wrench if you feel up to it
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#4
06-20-2007, 08:17 PM
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The set up on my 126 made it difficult to get much leverage with the channel locks. I sacrificed a cheap wood chisel. I tapped the chisel into the top surface of the nut on one side and then hammered it so as to make the nut turn.
__________________
Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/ 1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing  1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake. Both on single tank WVO blend
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#5
06-20-2007, 10:46 PM
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1 7/8" wrench
I used a 1 7/8" wrench to remove the sending unit on all 3 of my 123's. Used very little effort to remove the unit, the wrench is 2 ft long
Spray some brake cleaner or carb cleaner in the little hole and shake and repeat. The low fuel light finally works on all 3 cars.
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'83 240D 264k on 100% biodiesel/ 31mpg 83 300D 217K  the $800 gem '82 300D 267K the new WVO project car finished and driving for free International tractor B275 on B100 Ford 555 backhoe on B100 Sargent 25 ton Rough Terrain crane on B50  
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#6
06-22-2007, 08:59 PM
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Northern tools sells the 46mm socket for less than 10 bucks. If you don't have an adaptor for 3/4'' drive a 1/2'' to 3/4'' adaptor will cost about 5bucks. I thought I would return mine after I used them, but I have needed them a couple of times since then so... I'll keep them in the draw for those times. The right tool sure does make it easier.
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If it ain't broke take it apart and find out why. 1983 300SD, 4 speed 1994 C280 1987 300TD wagon 1996 HD Road King Ride in Peace Eric Peterson, Harley of Macon
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