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1. 12:00 PM - Re: Fuel Pressure (DaveG601XL)
2. 03:35 PM - Re: Re: Fuel Pressure (Larry Eubanks)
3. 06:02 PM - Re: Re: Fuel Pressure (FLYaDIVE)
Message 1
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| Subject: | Re: Fuel Pressure |
Bobby,
Let me throw in an observation I had on my 601 during early flight testing that
had a similar symptom which may or may not have anything to do with your experience.
My ACS gascolator came with the standard 120 micron mesh SS screen (P/N
10543-1). In the 2008 timeframe, ACS introduced a smaller 74 micron 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 the new screen in and all of
a sudden I could not perform the standard mag check run-up unless the boost pump
was on. Without the pump, the engine seemed 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 doused 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 was clean. I put the original
larger mesh screen back in and have been flying with it problem-free for
almost 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.
Just something to consider depending on which gascolater and screen mesh size you
may be using.
Good luck,
--------
David Gallagher
Zodiac 601 XL-B: flying, 200+ hours now
Next project under construction: Aircamper
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376583#376583
Message 2
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| Subject: | Re: Fuel Pressure |
David
I believe that the filter screen should actually trap any contaminants
inside the bowl area. Is it possible that it is plumbed incorrect? The bowl
should have been the area full of fuel instead of fuel being trapped before
it gets to the bowl.
Larry Eubanks
----- Original Message -----
From: "DaveG601XL" <david.m.gallagher@ge.com>
Sent: Monday, June 25, 2012 2:00 PM
Subject: JabiruEngine-List: Re: Fuel Pressure
> <david.m.gallagher@ge.com>
>
> Bobby,
>
> Let me throw in an observation I had on my 601 during early flight testing
> that had a similar symptom which may or may not have anything to do with
> your experience. My ACS gascolator came with the standard 120 micron mesh
> SS screen (P/N 10543-1). In the 2008 timeframe, ACS introduced a smaller
> 74 micron 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 the new screen in and all of a sudden I could not perform the standard
> mag check run-up unless the boost pump was on. Without the pump, the
> engine seemed 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 doused 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!
> was clean. I put the original larger mesh screen back in and have been
> flying with it problem-free for almost 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.
>
> Just something to consider depending on which gascolater and screen mesh
> size you may be using.
>
> Good luck,
>
> --------
> David Gallagher
> Zodiac 601 XL-B: flying, 200+ hours now
> Next project under construction: Aircamper
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=376583#376583
>
>
>
Message 3
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| Subject: | Re: Fuel Pressure |
Hello David:
Sure sounds like a fuel restriction problem.
But, maybe it was NOT caused by the finer mess; maybe the finer mess was
the last straw. There is a FAR requirement for Gravity Feed Systems for
the size of the fuel tubing. If there is a Mechanical Fuel Pump that
requirement goes away since the pump is on when ever the engine is running.
Boost pumps don't count. So, what size are the fuel lines? Next question
- Work out the surface area of the screen Vs micron hole size. If that
is under size as well - Yup - Fuel restriction.
Barry
On Mon, Jun 25, 2012 at 3:00 PM, DaveG601XL <david.m.gallagher@ge.com>wrote:
> david.m.gallagher@ge.com>
>
> Bobby,
>
> Let me throw in an observation I had on my 601 during early flight testing
> that had a similar symptom which may or may not have anything to do with
> your experience. My ACS gascolator came with the standard 120 micron mesh
> SS screen (P/N 10543-1). In the 2008 timeframe, ACS introduced a smaller
> 74 micron 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
> the new screen in and all of a sudden I could not perform the standard mag
> check run-up unless the boost pump was on. Without the pump, the engine
> seemed 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
> doused 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!
> was clean. I put the original larger mesh screen back in and have been
> flying with it problem-free for almost 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.
>
> Just something to consider depending on which gascolater and screen mesh
> size you may be using.
>
> Good luck,
>
> --------
> David Gallagher
> Zodiac 601 XL-B: flying, 200+ hours now
> Next project under construction: Aircamper
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=376583#376583
>
>
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