Ok, so apparently add another thing I need to plumb into the fuel
        delivery system -- a pressure regulator.  It's a real problem
   that I am
        so clueless on EFI fuel delivery system design -- I keep
   discovering
        things I need.  This area is a missing piece on the website,
   Paul --
        not
        a word to be found.  What little I have found elsewhere on the
   web is of
        little use as well.  Ah well... I suppose I will muddle through
   it all
        eventually.

        Here's my design so far -- those who have a clue, please chime in &
        tell
        we where I am going astray...

        Mark

        Very important. Please ask. Not everything is on the web site
        yet. Mark Wrathal has a good do's and don'ts  on his web site.

        http://members.aon.at/wrathall/rotary/

        Looks like the high pressure pumps need to go next to
        the shut off valve before the gascolater. The one way valves
        are built into the pumps. What brand of pump are you
        using?

        Paul Lamar ...No rotor no motor.



   Why would the gascolator need to be on the pressurized side of the
   system?  The information I've found has not suggested that design as a
   requirement.  BTW - you have the wrong Mark on the graphic -- (there are
   too many Mark's here lately!).  The other Mark bought the the fuel
   pumps, so I'll need to either go look at them, or ask him what they are
   -- unless you remember them (since you had them until just recently!)

   I will go review the web address you suggested (Another Mark! Yikes!) &
   see how that changes my current design.

   Thanks,

   Mark (As in Mark & Mark)

   The gascolator needs to be on the pressure side because
   the pumps have trouble sucking. If you have water drains in the
   tanks you probably don't need the gascolator. Is this 25 gallon
   tank in the cowl? If so that helps as the pumps now have a head to
   work with assuming the high pressure pumps are mounted under it.

   BTW Yes I got that figured out. See my last message on last names.

   Paul Lamar ...No rotor no motor.


The tank is behind the instrument panel, against the fuselage forward
top skin.  The pumps are mounted at the bottom of the firewall, appx 9"
below the tank sump -- so yes, there should definately be head for the
pumps to aid in priming them.  There is no tank drain, thus my desire to
have the gascolator (and associated drain valve) upstream of the pumps.
Sucking should not be needed given the head and the fact that there is
minimal line between the tank and the pumps (About 3' total).

I am going to test my pumps to prove to myself that they have integral
check valves.  I'll attach some tubing to the output port & pour in some
fuel in while holding the pump vertically.  If my feet get wet, I will
assume there is no check valve.  I like the idea of a filter
(particularly a see-through filter I can easily inspect) downstream of
the pumps.

Mark Supinski


Good idea Mark. Check the AC Spruce catalog and see if you can find
a tank drain that will work. An AN hose from the bottom of the tank
to the bottom of the fuselage will work as a water trap. The drain
fitting can be on the bottom of that.

Paul Lamar ...No rotor no motor.

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