I don't think the flow resistance in the fuel line contributes to vapor
lock. If you're worried about the resistance heating the fuel up, the heat
generated by the viscous losses in the fuel line at LR flow rates are
miniscule, especially compared to the heat transfered to the fuel from the
hot motor compartment. Rubber hose should be better than metal tubing
because the rubber will be a much better insulator and the fuel reaching the
carb will be cooler. If you still want to decrease flow resistance go to a
larger diameter hose. And if you want to use metal go with plated steel,
i.e. brake line.
In the past there have been suggestions to re-route the fuel line to keep
the fuel cooler. Also, a weak fuel pump can contribute to vapor lock. Have
you checked fuel line pressure, though I don't know what it should be.
Regards,
David Cockey
> I'd like to avoid vapor lock altogether and have a theory that the less
> resitance the pump is meeting, the better. Thus, the metal line, which I
> think was original (have to admit I've not checked), and which I think
> will be smoother inside and allow more efficient flow of fuel.
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