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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Mon Jan 14, 2008 5:54 am Post subject: Fine Fuel Filter |
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Gentlemen:
On page 38 of the Rotax 912UL engine installation manual, figure 22 shows
that a fine fuel filter (mesh size 0.1 mm) must be installed upstream of the
mechanical fuel pump. I assume this is the bowl/filter unit that protrudes
out of the belly of the plane that is installed between the fuel tank and
electric fuel pump. My question is how often does this "filter" have to be
checked, and since I have never opened the filter unit what type filter is
it, and can it be easily replaced if contaminated?
Hugh McKay
Allegro 2000
912UL
N661WW
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Mon Jan 14, 2008 5:54 am Post subject: Fine Fuel Filter |
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Gentlemen:
On page 38 of the Rotax 912UL engine installation manual, figure 22 shows that a fine fuel filter (mesh size 0.1 mm) must be installed upstream of the mechanical fuel pump. I assume this is the bowl/filter unit that protrudes out of the belly of the plane that is installed between the fuel tank and electric fuel pump. My question is how often does this “filter” have to be checked, and since I have never opened the filter unit what type filter is it, and can it be easily replaced if contaminated?
Hugh McKay
Allegro 2000
912UL
N661WW
[quote][b]
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue Jan 15, 2008 6:10 am Post subject: Re: Fine Fuel Filter |
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Hugh,
The nylon/plastic mesh filter in the little plastic bowl just downstream of the tank is Fantasy Air's idea of a gascolator. In the US it is customary and common practice for the gascolator to have a quick drain in the bottom of the bowl which is drained before each flight to eliminate sediment and water. Fantasy Air's gascolator does not have a drain valve. On most type certificated aircraft in the US, the gascolator is located on the engine side of the firewall. Also, it is a real PITA to clean because there is no shut-off valve between it and the tank. Therefore, to clean it you must drain the fuel tank then disassemble the gascolator. The good news is that you never need to replace the mesh filter element unless it gets perforated. If you are careful with it, it should last pretty much forever. I've complained about this deficiency and hope that they have corrected this on the newer 2007 models.
Because of the difficulty, we clean it only during annual inspection or when we need to drain the tank for other reasons. I got permission from Fantasy Air to replace this gascolator with one with a drain valve, even if it is not a PMA's part. This permission is required on an SLSA but not on an ELSA or Exp A/B certificated airplane. I found a good quality relatively inexpensive gascolator with drain valve at Great Plains Aircraft. Unfortunately it won't fit in the space available so we've not yet installed it. We're still thinking about how/where to locate it. The next best solution is to install a shut-off valve between the tank and gascolator to preclude the need to drain the tank, but it is still a bit difficult to remove the bowl and and re-install it after cleaning.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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