Well, blowing out the fuel system would be relatively easy, though I can say that without ever having done the job myself
In the front bay, look for the fuel supply line and unhook it from what I would imagine is a rubber hose somewhere (is yours a 6 or an 8 cylinder?) and attach your blower.
However, here's something to consider. Unless you intend to unhook the line going into the tank, you'll be blowing any gunk, crap or rust back into the tank, to regunkafy your pump at some future point. Have you instead thought about draining any old gas and putting the pickup tube into a glass jar with solvent, and letting your fuel pump do the job? You'd need to unhook the fuel delivery hose in the engine bay (and any return lines too)...
In 2009, I deployed and left my 108 with my dad, who used the car sporadically. In time (like by 2011, when I was returning), water collected in the tank and rusted the fuel pump solid. He took the thing off and sprayed a can of WD 40 into it, and let the thing sit for a few days. When he hooked it up to a power supply (backward), the thing ran in reverse and blew a buncha stuff out of the intake. Not having to pay $700 or so for a new pump was music to my ears, and when he put the thing back in, it worked like a charm.
Something to consider - a Ford or Chevy or VW or BMW fuel pump does the same thing as any Mercedes pump - it sends gas to an engine, using 12 volts. Some pumps are submersed in the tank, ours are external.
There's no reason why you can't use a different make's pump, or something from an aftermarket place, like Summit Racing. As long as you get something that delivers a minimum volume with a minimum pressure, you're golden (the numbers are somewhere in the "online resources" portion of the site). If you find something with a little higher pressure, that's no sweat too, as the regulators on the engine's fuel rail will keep the system at the right pressure.