Hi all, i'm new on the forum, so nice to meet you
I'm rebuilding my 350SLC's fuel distributor because the control piston was binding and the o rings around the metering slots were cracked and leaking. I've seen two variants of rebuild kits on the market; one with a stainless steel diaphragm as originally fitted on my distributor (so called 1st gen) and a variant with a rubber membrane.(so called 3rd gen. A 2nd gen set doesn't seem to exist) The sets seem otherwise identical.
What option should I go for, and does anyone know why two variants are available? I guess the 3rd gen rubber variant was an improvement, but i'm a bit reluctant with the ever increasing ethanol concentration of our precious petrol.. I guess this question has been asked before, but I couldn't find it on this forum or on google.