My Zeniths (1972) have the triangle shaped, rubber diaphragm fuel return valve. Can anyone explain how this thing works? I consistently have problems with this thing leaking - both from around the edges and from the connector hose that leads back to the front carb. I suspect that I have some slight warpage, or even some surface imperfections, scratches. I have tried some light sanding with 320 grit paper - will see if that helps.

I have a new rubber diaphragm in place but the thing still leaks around the edge. I'm thinking of fitting in a paper gasket cut to fit around the outside and then I will install the rubber one over it. Not sure if this will work - it's either this or try some gasket sealer, which I'm really not sure about.

Any advice?

ryan

__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE