Martin,
It sounds like you have the right size fuel pump and line.
5/16" is the correct size steel tubing for the fuel line (for the 235, at
least). The fuel pump and carb should be tapped for 1/8" NPT fittings. A
pipe reducer will not work here: the nut needs to push the inverted flare
of the tube into the seat of a brass inverted flare fitting in order for
it to seal. You should be able to obtain Weatherhead 202X5 or similar
fittings at your FLAPS for a few cents each.
Andrew
1949 3600
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