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912 Fuel Manifold

 
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johnelling



Joined: 23 Feb 2013
Posts: 18

PostPosted: Sun Nov 11, 2018 8:44 am    Post subject: 912 Fuel Manifold Reply with quote

The original builder of my titan tornado did not include a fuel manifold
with fuel return line.  Rotax does not like this so I've been planning
to add one along the lines of the figure in section 1.4.1 of the
installation manual Fuel Systems.  I figure I can also add a fuel
pressure gauge while I'm at it.

I'm concerned that the fuel pressure gauge handle the old pump (which I
have, max 5.8 psi) and the new pump if I ever need it.  It looks like
the UMA fuel sensor and gauges are calibrated for the 5.8 psi max.  How
have you dealt with this?

What is the fuel pressure sensor for?


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rickofudall



Joined: 19 Sep 2009
Posts: 1351
Location: Udall, KS, USA

PostPosted: Sun Nov 11, 2018 1:33 pm    Post subject: 912 Fuel Manifold Reply with quote

John, I think the fuel pressure gauge is there to make sure you don't over
power the needle valve.
When I added the feedback line to a Just Aircraft Escapade I had no way to
run the line back to one of the wing tanks so I ran it to the line before
the header tank. This turned out to be a big mistake as the feedback line
would allow the fuel to flow backward, bypass the fuel shut off valve and
keep the needle valves always under pressure. I wasn't able to solve it
until the owner added a different header tank and I was able to plumb it so
that there was an airspace in the top of the tank to act as a suction break


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Roger Lee



Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

PostPosted: Mon Nov 12, 2018 5:11 pm    Post subject: Re: 912 Fuel Manifold Reply with quote

The new max pressure is 7.2 psi. If you have an analog gauge for 10-15 psi your good. If you have something like a Dynon digital just go into the menu and set the max higher. 5.8 psi doesn't work at times with the new pumps.

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