In high-wing gravity feed fuel systems, 3/8" fuel line allows air/vapour
bubbles to bleed out upwards. 5/16" or less fuel line tends not to; the
bubble gets stuck. Less or no particular advantage in a low wing/tank
system, except that (under dynamic/flow conditions) head losses will be
greater with the smaller tube and will therefore have a greater potential
for vapour formation if fuel is sucked along the lines rather than blown
along.
Duncan McFadyean
-----Original Message-----
From: Rob Housman <robh@hyperion-ef.com>
Date: Saturday, September 02, 2000 12:21 AM
Subject: RE: Fuel lines
>Vapor lock is a function of temperature and total pressure, and of course
>the properties of the gasoline itself, but will not be affected by the size
>of the lines or the location of the feed. The simple fix is to control the
>temperature of the gasoline in the line, i. e., keep the lines away from
>sources of heat (increase the distance from the source of heat and/or add
>insulation) and provide adequate flow of cooling air.
>
>
>Best regards,
>
>Rob Housman
>A070
>
> -----Original Message-----
>On Behalf Of Nic
>Subject: Fuel lines
>
>Will larger internal diameter fuel lines fed from below remain vapor free?
>Nic #145
>
>
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