Today's Message Index:
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1. 05:55 AM - Vapor lock 914 (Peter Thomson)
2. 06:34 AM - Re: Vapor lock 914 (davidjoyce@doctors.org.uk)
3. 08:50 AM - Re: Vapor lock 914 (rampil)
4. 09:53 AM - Re: Vapor lock 914 (Roger Lee)
Message 1
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Friend has been having problems with "vapor lock" particularly at take off
power.
Aircraft is Pelican, high wing, L and R wing tanks feeding through a
L-Both-R-OFF selector to a gascolator, then through two Facet pumps in
series to carburetors, with airbox. Return line is T-eed back to the
gascolator. Most lines fire-sleeved.
Could the problem be fixed by taking the fuel return back to a wing tank ?
Message 2
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| Subject: | Re: Vapor lock 914 |
For what it is worth, the LAA approved arrangement for the 914 in a
Europa takes the return line back to the main tank situated in the
fuselage. There is substantial return flow which means that you are
getting rapid supply as far as the pressure relief valve of fuel at the
(hopefully low) temperature of the main tank. In >1000hrs flying this
arrangement in often very hot conditions, have never had serious vapour
lock problems. Regards , David Joyce
On 2015-07-20 13:54, Peter Thomson wrote:
> Friend has been having problems with "vapor lock" particularly at take off power.
>
> Aircraft is Pelican, high wing, L and R wing tanks feeding through a L-Both-R-OFF
selector to a gascolator, then through two Facet pumps in series to carburetors,
with airbox. Return line is T-eed back to the gascolator. Most lines fire-sleeved.
>
> Could the problem be fixed by taking the fuel return back to a wing tank ?
>
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Message 3
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| Subject: | Re: Vapor lock 914 |
Is the gascolator forward of the firewall (like cessnas) or in the fuselage (like
old pipers or my Europa)? Location and temperature make a difference.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444976#444976
Message 4
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| Subject: | Re: Vapor lock 914 |
Why does he think it is vapor lock? It could be something different especially
at take off when things haven't had a good opportunity to get really hot.
Why couldn't it be fuel starvation?
All the Flight Design's have their recirculation line go back into the gascolator
which is in the lower part of the engine compartment. None of them anywhere
has ever had an issue. There is plenty of cool fuel moving through here to prevent
vapor lock. If your gascolator were to be to near a heat source then it
could be affected. Depending on which of his fuel lines are not fire sleeved then
maybe this may contribute. You can plumb the recirculation line back to a
header tank, the wing or the gascolator and all are acceptable.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
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http://forums.matronics.com/viewtopic.php?p=444985#444985
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