Could someone tell me where the access to the fuel filter is for the fuel tank on a W123? Does the tank need to be drained in order to replace / clean it?

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1983 Stick Shift 240D (223K)

It's a screen. You can access it from the bottom of the car directly under the tank area. You'll need to drain the tank for sure.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

I'm guessing it's where the fuel line is coming out of?

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1983 Stick Shift 240D (223K)

yup, there is a fuel line going into it. Also, there is a large hex that you have to loosen. I'm not sure what size, but it's a large hex, you can't miss it. Do search as well. There are a few write ups IIRC.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
-------------------------------------
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

I did a write up on this a while back here:

http://www.peachparts.com/shopforum/showthread.php?t=166799

Scott

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Scott
1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
1987 Porsche 911 Coupe 109,000 (sold)
1998 Mercedes E300 TurboDiesel 147,000 (sold)
1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!)
1997 Mercedes E300 Diesel 236,000 (sold)
1995 Ducati 900SS (sold)
1987 VW Jetta GLI 157,000 (sold)
1986 Camaro 125,000 (sold - P.O.S.)
1977 Corvette L82 125,000 (sold)
1965 Pontiac GTO 15,000 restored (sold)