Hi,
I think many of us have seen this issue of fuel venting on warm to hot days
due to air/fuel vapour expansion.
The cure (and it works fine) is to route the vent pipe from the tank, to the
filler neck instead of the roof vent tube. Thus as fuel tries to vent
overboard, as in the past, it now vents back into the tank. Saves the mess
on the paintwork and also saves precious fuel!!!
You will however still need to vent the tank, so a further connection into
the filler neck now needs to be connected to the roof vent tube.
A further refinement used by some is to move the roof vent tube to the
bottom of the fuselage instead of the top. This later part of the mod
ensures that if for any reason the aircraft ends up inverted, fuel does not
run freely from the vent tube as it would if it remained on top of the
fuselage.
I think you will find this fix simple and very effective.
Pete Jeffers
---Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of jpg12305
Sent: 19 June 2009 18:40
Subject: Europa-List: Re: tank size
BTW I observed a nasty issue when leaving the aircraft outside on a warm
day, tank full (or close to).
Fuel spills off the vent, for what I presume being a significant quantity
(taints the paint, and significant traces on the ground).
This drove me to the assumption that a significant empty space remains over
the fuel, due to fuselage pitch on ground (3 wheels Europa's may not exert
that). With warming, vapor tension increases and push fuel out into the
vent.
I feel this ceiling space is wasted, on top of the spillage issue. Probably
a tube extending front from the vent port into the tank could permit
carrying more fuel, while avoiding the warming issue.
Has anyone already experienced and solved that?
Many thanks in advance,
Jean-Paul
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