Gradually I am going from most likely to less likely causes for vapor lock
symptoms.
(i.e., low power and lumpy running after 1/4 mile (consistently!) after
being parked a short while while hot on a hot day.)
I've had this problem since swappng to dual HIF carbs.
I've come to suspect fuel delivery pressure is less than fuel vapor
pressure at under-the-bonnet temperatures. I now have a
ridiculously long fuel line under there: why the front carb was chosen for
the fuel inlet baffles me.
Anyway, about the fuel pump spec: my manual sez 4 ft. of pressure for an
s.u fuel pump... well... being a chemistry teacher
and engineer I think that means 4 ft of water, which my slide rule
ultimately converts to 1.8 psig. Does that sound right? Seems low to me.
I'm going to go check mine now, if I can find my long neglected gauge...
Thanks
Gary Cook
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