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Should I get the metal or rubber diaphragm rebuild set for my 350SLC's fuel distributor?

380 Views 5 Replies 4 Participants Last post by  Petrolhead350
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.

Anyway thanks!
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I personally wouldn’t split the fuel distributor unless you need to. It’s very easy to screw it up and have it not seal. Unless you feel you have a distribution issue with a cylinder not getting fuel. I tried to resurrect one in the past but had no luck. The original was steel on the cast iron units. I would be afraid the rubber one might create different issues like throwing off the calibration. In fact pay special attention to the number of screw turns when taking anything apart since you will alter it but hopefully not too bad.
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