Well......Before you do anything, look real close at ALL the pipes and connections comprising the fuel pumps, accumulator, and filter. If there is any significant rust, or the hoses look brittle/cracked from age, I can guarantee a leak either during the removal or after. I'd advise removal of the entire assembly and do all the R&R on the bench. I started to gingerly turn one of the end fittings at the filter and
instantly got a leak in the line which twisted as the banjo bolt started to move!
On my '86 560SL, I ended up buying a pair of used pumps with associated plumbing (in VG condition) on EBay, and the seller threw in a new filter. Only problem was, the assembly was off a non-W107, a sedan, so I had to do some creative adaptation to get all the hoses and hard-lines to fit. It did work, and I saved significant $$ on the pumps and the rusted hard-line (that alone would've cost over $100.00, even from ******** AZ). My old pumps worked fine, they just made an awful whining noise.
If you need the car as daily transport, get everything in hand before touching the assembly with a wrench. Be especially cautious with pinching off the big hose from the tank. You really
don't want to have to replace this puppy! I waited until the tank was almost empty, then pulled the thing off and drained the rest into a big container, without risking pinching and rupturing it. Very, very messy BTW, get long sleeved rubber gloves and good eye protection.
All said and done, it was about 5 hours work to modify the sedan assembly to fit the SL, most of it in fitting the accumulator line and bracketry. If you don't need to do all this work, I'd go with about 1 hour to remove the assembly (I'm including jacking up the rear, draining the tank, and undoing bolts/nuts/hoses), about 1/2 - 1 hour to R&R at the bench (depending on what needs replacing)(don't forget to order new copper crush washers and hose clamps), and 1/2 hour to replace the assembly.
Not really a bad job....have fun
