Good Ideas?
Yes. Put the vent pipe into an anti-siphon bottle in the roof and finally
vent to atmosphere by passing a vent pipe from the high side of this bottle
down the PORT SIDE through the Flap Drive slot. ie:- no external vent pipes
to knock, any overflow discharges onto the ground and no vapours near the
filler. Approved by the PFA on my schematic drawing .
Regards
Bob H G-PTAG
> -----Original Message-----
> From: owner-europa@aztec.houxou.com
> Subject: Re: Fuel Tank Vent
>
>
> > Thus,
> >the filling process causes a small quantity of fuel to be sprayed
> >and vaporized near the filler area. In addition to being untidy
> >this could be a safety issue, i.e. there has been a report of a
> >fire in a Europa possibly due to a static spark at the filler
> >opening -- this fuel spray could cause a flammable mixture in
> >exactly that area.
>
> It would not surprise me if this was the cause of the fire in the German
> Europa. Maybe a spark between the filler funnel and the vent line
> vapour? A
> sort of Van de Graaf generator at work? Having talked to the guys I can't
> think of any other cause.
>
> >To minimize fuel spray from the vent during filling I am
> >considering adding an expansion volume in the vent line, the
> >concept being that air being vented pushes droplets of fuel along
> >through the vent line due to the air velocity. By adding a
> >section of larger diameter to the vent line the velocity in that
> >section will drop, reducing its ability to carry droplets which
> >should then collect and run back toward the tank. Flammable
> >fumes will continue to the vent outlet but droplets and spray
> >should be reduced or eliminated.
>
> This would reduce the velocity of vapour and droplets and might
> reduce the
> voltage generated. It would help a lot to increase the rate of filling,
> which is painfully slow due largely to the slow venting of the tank. Ever
> felt the air rushing out the vent?
>
> Good thinking, John. Any more ideas?
>
> Graham
>
>
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