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.



Now you are talking my language as an instrument tech (industrial). Why use
cad plated carbon steel fittings. This is designated by the single S prefix. I
would use either SS (stainless) there is a a couple of different stainless
types available or alloy. Also a couple of options. Use the SS ferrule sets.
With time the cadmium plating seems to let the nut stick to the fitting and it
takes some effort to break it loose. SS does not have the same problem. Its
problem lies with a lack of tolerance to cross threading. Proper tightening of
the fittings is important. Start with the nut just finger tight on the fitting
and then tighten 1 1/4 turns. Use a felt pen to mark it to get it right.
Also, I would use 1/2" return line to make sure there is no restriction there.
What is the method of connecting to the sumps. You show tube unions (600-6)
with the tube coming out of the sump. Another fitting available is SS-6-TA-1-?
i Left a question mark for the pipe thread size; 1/4,3/8, or 1/2"NPT. These
would be 4, 6, or 8 like AN designations. This would then allow the use of the
tube unions directly. A better option is SS-600-1-? tube adapter. If you need
a 90* then SS-600-2-?. There is also 45* available. This would eliminate a
possible leak source or two. You know every joint will leak eventually.
Swagelok has available a small catalogue that is about 6" x 3" and about 3/8"
thick that lists a lot of this and explains the codes for it's fittings. Also
pressure ratings for tubing sizes and materials.

Dale

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