Hi All, It?s been a while since I?ve been on the newsletter between
work and trying to make progress on the Long EZ. Anyway, it?s time
for the Fuel system and I wanted to get feedback from the group on
my design. I attached a PDF of my concept which utilizes 2
different sumps, 1 rear cockpit thigh support/fuel sump and a 2nd
sump in the hell Hole. The reason for the added sumps is to try to
recover some of the fuel I will be losing due to installing Infinity
retractable gear. Anyway, my assumption was a P-Ported 13B
with a
TO4 turbo so the lines need to be able to keep that thirsty puppy
humming at WOT. I guess it would make about 350hp at WOT.
Anyway,
can you guys take a look and shoot holes and make recommendations.
I look at the fuel system and Engine installation design as the
most critical systems we develop so I want it to be right.
Thanks
Mike C.
I'd put a fuel drain in the lowest part of each sump where lowest is
when the ship is parked.
I'd put the pumps in the last sump.
I don't see provision for fuel return.
tc
--
Thanks TC, cant believe I forgot the return line. I decided to do
away with the Hell hole sump, seems like I would be creating a lot of
work for little gain. I did add a fitting to the thigh sump so I
could add an Aux Tank if it was ever needed. Could just strap it into
the GIB seat. Anyway, I have a couple of questions about the fuel
return. Will it have enough pressure to overcome the head pressure in
the sumps from the Strake tanks? And the thigh sump is probably only
2-3 Gallons so should I be worried about hot fuel in the sump? Or
should I just return the fuel to the strakes? If I return it to the
strakes is there a chance I could empty the sump faster than the
gravity fill line can return it to the sump? Thanks again for all the
help guys. I attached an updated diagram, throw arrows!
Mike C.
Paul
I'm resending this because I never saw it posted, Might
have gotten lost in the ether.
Thanks
Mike C.
the return lines need to return to the tank or sump from which the
fuel was removed . Summer time heat increases the risk of vapor lock
when fuel is returned to the sump. Better to return the fuel to the
strake tanks. The sumps/tanks should be separate and feed of fuel is
from one or the other NOT BOTH SIMETANEOUSLY. Cross feed will occur
and will drain the tanks. See the write up on Central States Canard
News Letter. The vent to air line can be a 1/4" line with no problems.
Andair makes a valve which makes the selection of feed and return fuel
easy. Putting the sump tanks behind the front seat as a foot rest for
the passenger is a possibility. However fuel is then in the cockpit.
Chris Smale
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