Kruiswyk, Neil wrote:

Ed,

   IMHO, I think you've got a recipe for vapour lock here.  Bill and
Jeff mentioned another problem with re-circulating fuel through a little
tank on the firewall..  and that is heat build up.  Both from temps in the
cowl and from the fuel pumps themselves.  (For those that don't know.. these
high preasure pumps cool via the fuel fuel flowing through them, windings,
magnets and all.)

   The solution would be to vent the header back to the wing tanks.
This all becomes a little silly because then you would have 2 recirculating
systems requiring 2 running pumps to keep the motor going.

   If I may make a suggestion...  I think it would be better to use the
double ganged selector valve (one for fuel from the wing tanks, the other to
send the excess fuel back to the selected tank).  Alternatly, make the left
tank your main tank (or right, it doesn't matter) and run from that tank,
return the excess to that tank.  Then install a transfer pump from the right
tank to the left tank.

My 2 cents (Canadian cents)

Neil

 Ken Powell wrote:

     Neil's suggestion sounds like the system that Tracy Crook is running.
     This really has my attention.  It was 94 degrees here in AR yesterday.
     Even though I didn't say so directly in my original thread, the
     potential for vapor lock was my main worry.  I WILL circulate fuel
     from a main tank.  Seems like Tracy mentioned this when he installed
     his FI system.  Lest I be accused of flying under false colors, I
     haven't even started my RV project yet; I should finish a miniMax this
     fall though.

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