Hi All,

My original post did not go through. So giving this a try.

Have a Zenith 35/40 dual carb setup in my 1967 250S. I know that the diaphragm in the fuel return valve assembly is leaking because of pinholes because I pressure tested the diaphragm.

I have not seen any posts here on how to either seal the pinholes? Or, how disable the fuel return function by forcing the needle/piston in the closed (pushed up).

The pinholes cause gas to leak from the assembly anytime the engine is on.

Thanks in advance.

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Currently enjoying:
1967 250S - all manual with 4-spd on floor-- my Nifty 250