Simon Smith a crit :
>
>
>Further to all the discussion on parallel v series, I put fuel in my
>aircraft for the first time today and found an interesting "effect" that I
>had not expected.
>
>I have a 914 plumbed the latest series way (Nov 2004 issue 8).
>
>With only pump 1 running the fuel flows through "filter 1" which is fairly
>obviously the only way from the diagram. With pump 2 running, it pulls the
>fuel through "filter 2" in preference to pulling it through filter 1 and
>pump 1. However, with both pumps running all the flow is through filter
>one. I had sort of expected pump 2 to still draw through filter 2 but this
>is not the case. It would seem that filter 2 will only be used if pump 1
>and/or filter 1 fail in some way. Has everyone else found the same or is
>anyone getting a different flow pattern with the series setup?
>
>
Simon and all,
Not too easy to figure out your fuel system, if you're not a Europa
builder ;-)
From what you're telling us, I believe you've plumbed per the Rotax
"series" diagram. What I'm not sure of is, where is your "filter 2" ?
The "series" system draws fuel from only one point, so why a "filter 2" ?
What you need is a finger mesh strainer at each tank pickup point, a
drainable gascolator upstream of the pump assembly, and a drainable sump
at the lowest point of the fuel tank.
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
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