Let's go with the best two out of three. But seriously, the parallel
arrangement (as I too have done it) is simpler, with fewer components, which
meets my requirements for good engineering. I haven't a clue why the Rotax
folks would change from parallel to series, and can not think of a single
advantage to running two pumps in series, unless the pumps used in series
are so puny as to need a two stage arrangement just to get sufficient
pressure - and that would be really bad engineering for something essential
to keeping the big fan turning.
I have searched the "Publication Index for ROTAX Aircraft Engines" at the
Rotax web site and found no Service Bulletins that even mention the 914 fuel
pump nor any indication that there is a need to change from parallel to
series plumbing.
Best regards,
Rob Housman
Europa XS Tri-Gear A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of paul stewart
Subject: Europa-List: fuel system
<paul-d.stewart@virgin.net>
I think this may have been discussed before but I cant remember. The europa
914 installation manual and the Rotax installation manual(1996) both
instruct me to set up the two electrical fuel pumps in parallel - which I
have now done in aluminium fuel line. The Rotax operators manual(1998)
however instructs me to have the two pumps in series with two one-way chech
valves in parallel to them. Whats a man to think?
Regards
Paul Stewart #432
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