Many thanks to Carl, Sam and Paul for quick replies. I will go looking for
a suitable transition piece from branched off fuel hose to the threaded
pressure sender, and somehow mount this on the firewall below the point
where I branch off from the fuel hose, so there is no chance of vapo(u)r
building up over time in front of the sender.
There are two distinct differences between the 912S and 914 installations in
this respect, as far as I understand:
(1)912S does not have a pressure regulator just before the carbs as on 914
(it is probably incorporated in the 912S's mechanical pump?).
(2) As the airbox on the 912S has (close to) ambient air pressure, while the
914's airbox of course has the overpressure from the turbocharger, it is on
912S adequate to measure only the actual pressure in the fuel line and not
adjust this for the "counter-pressure" in the airbox, to arrive at what
pressure the carb needle actually "feels".
It is interesting to note that the Rotax installation manual does not
specify a fuel pressure reading for 912S, and as far as the 914 only
"recommends" it. The Rotax dealer for Scandinavia does not even have
anything in particular to offer for 912S in this respect. What does PFA
require in the UK for non-gravity fed fuel systems? In Norway it is
actually required to have a fuel pressure gauge in such cases - apart from
being a good thing to have, too.
Regards,
Svein
-----Opprinnelig melding-----
Fra: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]P vegne av Paul
McAllister
Sendt: 13. oktober 2004 02:18
Til: europa-list@matronics.com
Emne: Re: Europa-List: Fuel pressure sender
<paul.mcallister@qia.net>
Svein,
I have a 914 so this might not be relevant for a 912S. I purchased another
banjo fitting and a longer banjo bolt from Lockwood. I put the new fitting
next to the existing fitting on the pressure regulator and ran a rubber hose
to the pressure sensor which I mounted on the firewall. I used a UMA
pressure sensor which is a differential sensor. The return side is
connected to the airbox.
Paul - 120 hours and still grinning
http://europa363.versadev.com/
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