Hi Alex. The effective length of the rod will have a bearing on the volume of fuel pumped. As has been suggested, find the right one.
I suppose you could make one the right length with a washer on the back and a nut on the other.
you certainly do not want it to leak petrol into your sump.
An alternative is to use your new diaphragm as a seal, pumping fuel through the correct looking AC pump with an electric pump?
I have seen an engine run its bearings from a leaking diaphragm.
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