Today's Message Index:
----------------------
1. 06:54 AM - Re: fuel filter (Sacha)
2. 08:25 AM - Re: Re: fuel filter (FLYaDIVE)
3. 09:02 AM - Re: Re: fuel filter (Sacha)
Message 1
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Hi Listers, does no-one know the answer to the below? Any help would be
greatly appreciated!
Sacha
Kitfox IV, Rotax 912, Italy
I was re-reading the 912 installation manual and noticed that it recommends
a 30 micron fuel filter in the unpressurized section of the fuel system and
then a 15 micron filter in the pressurized section. My Kitfox only has a
gascolator.
Can someone recommend a filter to install in the pressurized section? Where
exactly would one put it? A filter with replacement cartridges that are
easy to buy in Europe would be a plus.
Message 2
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| Subject: | Re: RE: fuel filter |
Hello Sacha:
The Pressurized Vs Unpressurized locations is dependent on the installation
set-up you have. Basically the Unpressurized side is coming from the fuel
tank and the Pressurized is everything after the Fuel Pump. Do you have a
Electric Boost Pump installed? That is usually installed 'upstream' -
Before the mechanical fuel pump so - - The unpressurized is now BEFORE the
electric boost pump, which may have its own built in filter (Faucet).
I really do not see any reason why there should be two different micron
size filters. There are three requirements:
1 - What ever filter you chose it MUST be able to handle TWICE the maximum
fuel pressure.
2 - The micron size should be small enough to catch the smallest size
particle that could cause a problem. Since there is a
suggestion/requirement to use a 15 micron filter, I would use that size in
both locations. Why pass on a dirt particle from one filter and part of a
system further down and maybe into a difficult to reach part of the system.
3 - Fuel flow is dependent on a few factors:
Fuel Pressure
Fuel Line Size - Both Diameter and Length
Filter Area
Install the LARGEST surface area size, filter that will fit. It will
filter better with much less chance of clogging AND it will even increase
the fuel capacity of your plane ;-)
Now, where to get such a filter?
On the RV6 that I fly, I installed a clear plastic Automotive Fuel Filter,
on each wing tank. Look for a LARGE filter that advertises the working
fuel pressure [WP or SBWP]. Because of this planes fuel line location I
can see the filters while flying the plane. It is my first line of defense
for fuel contamination.
After the filters there is a Boost Pump then the Gascolator (Personally I
do not like Gascolators as they are difficult to service both at pre-flight
and safety inspection. And, I have never seen any contamination collected
in them. A good thing, but if the inline filters work and the boost pump
filter works... More is not always better; then comes the mechanical fuel
pump.
Here in the States the cost of these filters is around: $3 to $5 each (USD).
As a side note: I have seen some very large fuel filters that look like
they could store a liter. They are metal bodied and cost about $8 to $15
USD. Two of them would increase your planes fuel capacity and time.
*Barry*
NJ has taken the next step. They are identifying cars with bad drivers.
You will notice some cars with a large red "R" on them. That is to
identify the drivers as "R"estricted. Restricted is just a polite way of
saying Bad Drivers. Be cautious around them.
>
>
Message 3
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Hi Barry, thanks for your comments. My setup is as follows (a/c is a
Kitfox):
8mm (5/16=94) ID hoses going from:
Wing tanks
=E8 header tank (located behind the seat)
=E8 Gascolator (ACS)
=E8 Electrical fuel pump (no inbuilt filter; there is a line that
bypasses the
fuel pump and has a one-way valve ' just in case the fuel pump gets
blocked)
=E8 Mechanical Fuel pump
=E8 Engine and return line to Gascolator
I understand your comments about 30 vs 15 microns, however=85 I=92m
thinking
that if the Rotax installation manual says 30 and then 15 there must be
a
reason=85 so I=92d rather follow their instructions exactly. So this
means I=92m
thinking of putting the 15 micron fuel filter between the Mechanical
Fuel
Pump and the Engine
Summarizing what you have said, you recommend:
- Able to withstand at least twice the max fuel pressure in the
lines
- With a large surface area
My question is: what fuel filters do people on this list use/recommend?
Some brand names and/or a photo or two would be much appreciated!
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
FLYaDIVE
Sent: Thursday, 24 October, 2013 16:25
Subject: Re: RotaxEngines-List: RE: fuel filter
Hello Sacha:
The Pressurized Vs Unpressurized locations is dependent on the
installation
set-up you have. Basically the Unpressurized side is coming from the
fuel
tank and the Pressurized is everything after the Fuel Pump. Do you have
a
Electric Boost Pump installed? That is usually installed 'upstream' -
Before the mechanical fuel pump so - - The unpressurized is now BEFORE
the
electric boost pump, which may have its own built in filter (Faucet).
I really do not see any reason why there should be two different micron
size
filters. There are three requirements:
1 - What ever filter you chose it MUST be able to handle TWICE the
maximum
fuel pressure.
2 - The micron size should be small enough to catch the smallest size
particle that could cause a problem. Since there is a
suggestion/requirement to use a 15 micron filter, I would use that size
in
both locations. Why pass on a dirt particle from one filter and part of
a
system further down and maybe into a difficult to reach part of the
system.
3 - Fuel flow is dependent on a few factors:
Fuel Pressure
Fuel Line Size - Both Diameter and Length
Filter Area
Install the LARGEST surface area size, filter that will fit. It will
filter
better with much less chance of clogging AND it will even increase the
fuel
capacity of your plane ;-)
Now, where to get such a filter?
On the RV6 that I fly, I installed a clear plastic Automotive Fuel
Filter,
on each wing tank. Look for a LARGE filter that advertises the working
fuel
pressure [WP or SBWP]. Because of this planes fuel line location I can
see
the filters while flying the plane. It is my first line of defense for
fuel
contamination.
After the filters there is a Boost Pump then the Gascolator (Personally
I do
not like Gascolators as they are difficult to service both at pre-flight
and
safety inspection. And, I have never seen any contamination collected
in
them. A good thing, but if the inline filters work and the boost pump
filter
works... More is not always better; then comes the mechanical fuel
pump.
Here in the States the cost of these filters is around: $3 to $5 each
(USD).
As a side note: I have seen some very large fuel filters that look like
they could store a liter. They are metal bodied and cost about $8 to
$15
USD. Two of them would increase your planes fuel capacity and time.
*Barry*
NJ has taken the next step. They are identifying cars with bad drivers.
You will notice some cars with a large red "R" on them. That is to
identify the drivers as "R"estricted. Restricted is just a polite way
of
saying Bad Drivers. Be cautious around them.
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