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archermj(at)swbell.net
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 Posted: Tue Mar 14, 2006 4:12 pm Post subject: fuel filters and such |
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Hi folks, Want to poll the crowd.
For my fuel system on my XL I am looking at using the flexable fuel lines
from the wings to the fues. Then going with 1/4" Al 3003 tube to a filter
on each side. Then to the fuel selector, which is lowered close to the
floor by an extension rod from the selector. Then forward to the gasolator.
Then to the Facet pump. Then to the firewall.
What do you all think?
Does anyone have opinions on fittings. Aluminum, Steel, or Brass?
Any recommendations on filters?
I may also put a fuel flow transmitter. Thinking of placing this between
the gasolator and the pump?
I appriciate your inputs
Cheers
Matt
www.zodiacxl.com
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daberti(at)sbcglobal.net
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| Posted: Tue Mar 14, 2006 4:53 pm Post subject: fuel filters and such |
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3/8" at least to the firewall.
--
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larry(at)macsmachine.com
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| Posted: Tue Mar 14, 2006 5:14 pm Post subject: fuel filters and such |
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Matt & Jo wrote:
| Quote: |
Hi folks, Want to poll the crowd.
For my fuel system on my XL I am looking at using the flexable fuel lines
from the wings to the fues. Then going with 1/4" Al 3003 tube to a filter
on each side. Then to the fuel selector, which is lowered close to the
floor by an extension rod from the selector. Then forward to the gasolator.
Then to the Facet pump. Then to the firewall.
What do you all think?
Does anyone have opinions on fittings. Aluminum, Steel, or Brass?
Any recommendations on filters?
I may also put a fuel flow transmitter. Thinking of placing this between
the gasolator and the pump?
I appriciate your inputs
Cheers
Matt
www.zodiacxl.com
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| Quote: | Matt,
I think you should put 3/8 aluminum tube from the tanks thru the fuselage firewall and then go the flexible
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hose line only after passing thru the gascolator and the fuel pumps. Flex hose might serve better at the filter.
The hose needs to be in a place that is easily checked each time you do
a preflight. Aluminum tube
in the wings is a way to get piece of mind between annual inspections.
I don't recommend brass with exception of finger strainer fittings and
no steel for anything in fuel fittings or lines..
Larry McFarland - 601HDS
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gfmjr_20(at)hotmail.com
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| Posted: Tue Mar 14, 2006 7:16 pm Post subject: fuel filters and such |
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Matt--
This is another one of those questions that will have as many answers as
people that reply.
On my XL I've run with 1/4 inch flexible line from the wing tanks to the
fuse. 3/8 inch
3003 in the fuse to the gascolator on the lower right bottom of the firewall
and
flex 1/4 inch for the engine area. Fuel pump is mounted engine side of
firewall after
the gascolator and before the final filter. (also have a return line to left
tank for
vapor lock mitigation). All cabin fitting are aluminum.
I'm using the Dynon with a fuel flow meter. If you do use a fuel flow
meter, plan
to place it downstream of the pump and plan your fuel lines to allow for 6
inch
straight sections before and aft of the flow meter.
George May
601XL 912s
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed Mar 15, 2006 3:31 am Post subject: fuel filters and such |
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I wouldn't put any filters ahead of the fuel pump. The fuel strainers in the
tanks should keep out any particles large enough to interfere with the pump.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
| Quote: |
For my fuel system on my XL I am looking at using the flexable fuel lines
from the wings to the fues. Then going with 1/4" Al 3003 tube to a filter
on each side. Then to the fuel selector, which is lowered close to the
floor by an extension rod from the selector. Then forward to the gasolator.
Then to the Facet pump. Then to the firewall.
|
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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frank.hinde(at)hp.com
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| Posted: Wed Mar 15, 2006 7:41 am Post subject: fuel filters and such |
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I think more importantly you need to understand the principles of vapour
lock, then decide how much risk you want to take.
As vapour lock can stop your engine dead on take off on a hot day, my
system is designed so that VL is an almost impossibility. Note that
mogas will boil more easily than 100LL.
The problem with this system is that it means your fuel pumps will be as
close to the tanks as possible (assuming you have wing tanks only). This
is the reason all cars these days have the pump back there.
This system however means that each pump will suck from each tank which
means the reserve really has to be held in each tank. The upside is that
it is a delightfully simple system in that to switch tanks you simple
turn the other pump on and this one off...if you see what I mean.
You don't mention whether you have a mechanical pump or not...Personally
I hate mechanical pumps (or electric pumps on the engine side of the
firewall) because they both suck on the fuel and are in the hottest
place on the airplane. Both prime reasons to cause VL. This is why
"Proper" FI airplanes have the electric boost pump in the cabin down low
to pressurise the inlet to the mech pump.
So now you know that a pump that sucks on warm fuel is the big danger
now you have to decide what you want to do knowing that "suck" and "hot"
are bad.
Now you do have some dihedral...You can put both electric pumps
(assuming no mechanical pump) in the middle of the cabin and have a
selector valve feeding the inlet from each tank. I strongly recommend
you keep the lines feeding from the tanks to the inlet to the pump at
3/8's and preferably aluminium. (less pressure drop)...No other
restrictions on the inlet side to the pumps if you can possibly avoid
them. Tank strainers are OK but no other filters, not that they will
cause you problems but they certainly could.
I would personally avoid having the gascolator upstream of the
pumps...if it devlops a leak it will likely such air into the pump and
air lock it...which is almost as bad as VL.
Gascolators work just fine on the discharge side of the facet fuel
pumps.
Do an archive search on this issue, thee is MUCH discussion on this one
--
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JAPhillipsGA(at)aol.com
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| Posted: Wed Mar 15, 2006 11:18 am Post subject: fuel filters and such |
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Matt, I did much the same thing you are talking about on my XL. If you want
to see them they were posted on 601.org under Bill's photos. Be happy to help
in any way, Best regards, Bill of Georgia
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archermj(at)swbell.net
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| Posted: Thu Mar 16, 2006 4:58 pm Post subject: fuel filters and such |
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Thanks for all the great advice. I am in the design phase and it is always
great to bounce ideas around. Always better to change it on paper than when
the AL is cut.
do not archive.
Cheers
Matt
www.zodiacxl.com
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