How does one achieve this... Which line? I've searched around and couldn't find any info. Which line to drain? Also I know there's four bolts behind the panel in the trunk, is that all that's required for removal?

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

There's a hose above the right rear axle that goes straight down from the strainer fitting. There's a 30-40mm hex around the base of the strainer.

Sixto
83 300SD

i drained my tank by transferring the fuel to the other car via the lift pump.

took an hour or so at idle. when the tank was empty, i put the fuel lines back, primed and done.

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1991 300D

Cleaning ?
Leaks?
Slow weekend?

Don't forget:

That there is a "Vent" system (Hoses and Vent Valve)
That the "Fill Pipe and Hose" must be R+R-ed from the Tank.
That the Fuel Gauge Sender is tucked under the top of the Trunk opening.
(And youse Gotta unplug it at the least.)

AND,AND,AND Because of the design of the Tank Bottom (Inside) at the
"Fuel Sock" [internal gross fuel filter,Or Strainer] there is a circular dam around the
opening that will retain a certain amount of Diesel EVEN when you'd swear
the Tank is completely empty.
(In Plain Anglais be careful removing the [Now allegedly Empty]Tank from
the Trunk NOT to spill the remainder of the Diesel into the Trunk!)

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'84 300SD sold
124.128

I put an electric inline lift pump just before the injection pump and drained it in 5 minutes.
http://i.imgur.com/iqbSGhQ.jpg

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CENSORED due to not family friendly words

I disconnected both fuel lines in the engine compartment, blocked off the tank vent, attached a long hose to the supply side to a bucket and attached an air line to the "return" line and fed with 10 PSI from an air compressor. Took me about 10 mins to drain the tank (only had about 7 gals left in it).

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

The tank strainer has a 46mm (1 13/16") hex, the fuel lever sender also has the same 46 mm size hex.