Is it a M103 engine?

Never did it myself,

I would try without removing any pump etc. I believe that the length is so short that one can squeeze that hose.

Just a hint if it can be of any help for you. if I would have to do it, I would use the lubricant used by shops that mount the tyres. I use it every time and it makes the rubber to slip so fine that it is amazing.

Keep us posted.

Good luck

__________________
Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km