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kheindl(at)msn.com
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 Posted: Mon Sep 04, 2006 3:36 am Post subject: Fuel smell |
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Guys,
Before blaming the carb heater for the fuel smell, why not be 100 % sure
before adding mods. Just disable the coolant flow by putting a clamp on one
hose for one or two test flights, and get the engine nice and hot.
I have fuel smells, too. But in my case one source is the old hoses, some of
which I will change at the next annual.
Karl
[quote]From: JEFF ROBERTS <jeff(at)rmmm.net>
Reply-To: europa-list(at)matronics.com
To: europa-list(at)matronics.com
Subject: Re: Skydrive on/off control
Date: Sun, 3 Sep 2006 21:24:07 -0500
Tim,
Actually I do smell fuel once in a while. I don't remember seeing any fuel
stains but I may take the cowl off and look closer now. I have a small fuel
valve that I didn't use so maybe that would work for turning the hot water
off. Would now like to hear what others have used for the job.
Jeff
A258. Flying off the 40 & maybe another bug just found me. Thanks Guys ;(
On Sep 3, 2006, at 2:43 PM, Tim Ward wrote:
>
>
>Jeff,
>Do you have any fuel smell problems?
>Cheers
>
>Tim
>Tim Ward
>12 Waiwetu Street,
>Fendalton,
>Christchurch, 8052
>New Zealand
>
>Ph +64 3 3515166
>Mobile 021 0640221
>ward.t(at)xtra.co.nz
>---
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grahamsingleton(at)btinte
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| Posted: Mon Sep 04, 2006 1:29 pm Post subject: Fuel smell |
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Karl & everyone
A few of us were talking about this at the PFA Rally couple of weeks
ago, someone pointed out that there is another possible source of
smells. The tank breather. When the aircraft climbs, air in the tank and
breather system has to expand.
When refueling some fuel gets pushed into the breather pipe, (I've seen
it many times.) After take off any air trapped in the tank will expand
as the aircraft climbs, the only way it can do that is up the tank
breather so fuel will get pushed out the breather, hence the blue stains
on the fuselage. The same thing happens if the aircraft is refueled
cold, then the sun comes out and we warm up.
Paul McA and I put the breather syphon break into the top of the XS
filler trunk which should prevent any fuel being expelled.
Graham
Karl Heindl wrote:
| Quote: | Guys,
Before blaming the carb heater for the fuel smell, why not be 100 %
sure before adding mods. Just disable the coolant flow by putting a
clamp on one hose for one or two test flights, and get the engine nice
and hot.
I have fuel smells, too. But in my case one source is the old hoses,
some of which I will change at the next annual.
Karl
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g-iani(at)ntlworld.com
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| Posted: Tue Sep 05, 2006 12:55 am Post subject: Fuel smell |
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g-iani(at)ntlworld.com
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| Posted: Tue Sep 05, 2006 1:14 am Post subject: Fuel smell |
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Graham has said "When refuelling some fuel gets pushed into the breather
pipe, (I've seen it many times.) After take off any air trapped in the
tank will expand as the aircraft climbs, the only way it can do that is
up the tank breather so fuel will get pushed out the breather, hence the
blue stains on the fuselage. The same thing happens if the aircraft is
refuelled
cold, then the sun comes out and we warm up."
My recent experience with G-IANI and G-IRON is that the smell is from
fuel trapped in the breather. Remember the inside end of the breather
is turned up so any fuel which enters is trapped in the "U" created
before the breather turns up to the roof (or top of filler neck). This
means the connection of the F09B fitting to the vent tube is wet with
fuel for long periods. Even with a good clip the seal between the F09B
and the plastic tube is very poor (this seems to be because of the way
the F09B is machined). We realised this when the joint was actually wet
with fuel when G-IRON was accidentally slightly over filled.
We have replaced the lower end of the vent pipe (from the F09B fitting
to half way up the filler neck) with rubber pipe which seals well on to
the F09B. This introduces another connector (and so potential source of
leak) but seams to have cured the problem.
Ian Rickard #505 G-IANI XS Trigear
Europa Club Mods Rep (Trigear)
e-mail mods(at)europaclub.org.uk
or direct g-iani(at)ntlworld.com
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