Today's Message Index:
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1. 06:00 AM - Re: Re: Fuel Pressure (Alvie Johnson)
2. 07:50 AM - Gascolator (BobbyPaulk@comcast.net)
3. 08:27 AM - Gascolator (BobbyPaulk@comcast.net)
Message 1
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| Subject: | Re: Fuel Pressure |
Reply to jabiruengine-list@matronics.com=0A=0A=0A>_________________________
_______=0A> From: DaveG601XL <david.m.gallagher@ge.com>=0A>To: jabiruengine
-list@matronics.com =0A>Sent: Monday, June 25, 2012 1:00 PM=0A>Subject: Jab
iruEngine-List: Re: Fuel Pressure=0A> =0A>--> JabiruEngine-List message pos
ted by: "DaveG601XL" <david.m.gallagher@ge.com>=0A>=0A>Bobby,=0A>=0A>Let me
throw in an observation I had on my 601 during early flight testing that h
ad a similar symptom which may or may not have anything to do with your exp
erience.- My ACS gascolator came with the standard 120 micron mesh SS scr
een (P/N 10543-1).- In the 2008 timeframe, ACS introduced a smaller 74 mi
cron mesh screen (P/N 05-03436).- Thinking that smaller was better from a
filtration standpoint, I bought a 74 micron screen.- Up to now I had no
fuel delivery issues whatsoever and was only using fresh 100LL.- I put th
e new screen in and all of a sudden I could not perform the standard mag ch
eck run-up unless the boost pump was on.- Without the pump, the engine se
emed like it was running out of fuel.- I sumped the gaslocator and only a
small amount of fuel would come out, but when I pulled the screen, I got d
oused with all the fuel sitting on top of it.- Hmmm, sounds kind of like
your symptom.- I pulled the small mesh screen and, as expected with
only 15 minutes of run time, it!=0A>- was clean.- I put the original l
arger mesh screen back in and have been flying with it problem-free for alm
ost 4 years now.- I think the 74 micron screen is just too small for the
head pressure in a low wing airplane unless you plan to run boost pumps all
the time.- I cut it up and threw it in the trash.=0A>=0A>Just something
to consider depending on which gascolater and screen mesh size you may be u
sing.=0A>=0A>Good luck,=0A>=0A>--------=0A>David Gallagher=0A>Zodiac 601 XL
-B: flying, 200+ hours now=0A>Next project under construction: Aircamper=0A
>=0A>=0A>=0A>=0A>Read this topic online here:=0A>=0A>http://forums.matronic
=========================0A
=========================0A
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>=0A>=0A>=0A>=0A>=0A>
Message 2
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Dave,
Thanks for the info on the screen size in the gascolators. If the 100 micron size
has been used since the Wright Bros. I wonder why it was changed?? Sometimes
newer is not better.
Your description of the episode you had fits exactly what happened to me. I will
check the part number and replace if is the smaller size.
Info like this may keep me and some others out of the trees.
Thanks again
Bobby ( age 74 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 155 hrs.
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Message 3
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List,
David and I were referring to the fuel that is trapped Downstream of the gascolator.
It will be between the gascolator screen and the firewall or fuel pump(
s ). When the gascolator is removed the screen is held in place with a thick gasket
and tight fit around the inlet to the gascolator. The weight or pressure
of the gasoline is not sufficient to flow backward thru the screen even if it
is clean. It may even be under a partial vacuum. So when you slide a dental pick
or knife blade under the screen to remove it you will get a backflow of the
fuel that was trapped in the line. If you are lucky it will drip off your elbow.
If you are laying down you will get an armpit full.
Hope this clarifies what we experienced.
Bobby
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