Originally Posted by mramay

Concur. Loosen the fuel filter and crank it until you get a little fuel out of the filter. Loosen several (all?) of the steel injector line fittings at the injectors and crank until you get fuel dribbling out. Tighten the fittings. On my W123 and 116, there is a small hand priming pump on the side of the engine that I used to get fuel showing at the loosened filter, then I'd tighten the filter. Then I'd loosen the steel fittings at the injectors (17mm wrench on a 617 engine) and get my wife to crank the engine. When fuel showed up at the fitting, I'd tighten it. After a couple of them were primed, the engine would try to start, or actually start, whereupon I'd tighten the rest and see if the engine picked up a normal idle.

Not hard to do at all, but there is a sequence to it.