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----- Original Message -----
Sent: Thursday, May 27, 2004 6:39
PM
Subject: [FlyRotary] Re: Fuel Pump
Design
Hi Bob;
Most (all?)
hi-press fuel pumps have a built in check valve so this can be eliminated.
Your transfer pump from the aux. tanks, I'm assuming a Facet pump? In this
case, while they don't guarantee no backflow, it has been my experience that
they hold pretty well, so a check valve could be eliminated here as
well.
As Finn already mentioned, you can't have a "T" that
draws off of 2 low wing tanks at the same time. You need to be able to isolate
them. For the same reasons I would suggest that you also don't have an
equalization pipe, between the main tanks. I would consider this be a failure
point, as that pipe could lose all of your fuel, in a very short amount of
time if it ever became compromised.
Another point to consider is that if you are planning
on using Tracy's EC2/EM2 combination, then you don't need fuel flow
transmitters. There are many other reasons to go with this, but easy fuel flow
monitoring is a good one.
I've been discussing the removal of my header tank with
Ed and he has pointed out the new returnless fuel systems on some newer
vehicles. I'm closely examining them to see if there is the possibility of
using this concept in my plane. if it works it would simplify fuel system
design for us.
Hi, Todd.....I originally considered the returnless fuel
system a while ago. While doing an internet search on fuel filters, I found a
few that have an additonal inlet that is designed for the fuel return line so
that it goes directly to the fuel filter, then recycles back to the engine,
instead of going back to the tank. It is designed for race cars, etc. I
suspect you would not want to place the fuel filter too close to the engine to
prevent it from being too warm. Paul
Conner
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