It is always instructive to have look at what is done on type certificated
aircraft.
Attached pages from the Diampnd Katana show the aircraft fuel system. As
you can see: the return line goes to the top of the fuel tank, which is located
behind the seat, as in the Europa. There was a one way valve in the return
line of the first 90 production aircraft. Then the one way valve was removed on
subsequent production aircraft and a Service Bulletin was issued to allow the
retrofit of this modification, probably for a good reason.
Another thing is the diameter of the restrictor. The diameter of the restrictor
supplied with the kit by Europa is .75 mm while ROTAX specifies .35 mm in their
912 series Installation Manual. I believe .35 is appropriate whenever the return
line goes to the top of the tank and the bigger diameter is necessary in
the Europa configuration due to somme back pressure caused by the line returning
to the bottom of the tank.
Remi Guerner
F-PGKL
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