> Hi all,
>
> I have a question if I may.
> Mod 33 shows the starboard drain tank outlet used also as the return line
> tank inlet.
> The pictures I see with Graham Singleton's adapters for threaded
> connections all show the return line going to the vent outlet if I'm not
> mistaken.
> Is this recommended, if so why?
Several years ago I submitted a Modification request to PFA Engineering to
cover a revised fuel system with aluminium pipes and home-brewed tank
fittings, much like Graham's. The return feed went back via a drain outlet.
Francis made several comments. One of them was that this return route was
not the best as in the event of a serious engine bay fire in which the
flexible hoses were destroyed it would be possible for fuel to be fed from
the tank along this return line which could not be turned off. In theory
most of the tank contents could feed the fire. Raising the return point to
the vent inlet removed this possibility (unless you came to rest on the
ground inverted, tail high).
John Cliff
#0259
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