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----- Original Message -----
Sent: Thursday, May 27, 2004 6:39
PM
Subject: [FlyRotary] Re: Fuel Pump
Design
Haywire wrote:
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.(snip)
I would suggest you keep these checkvalves. Not to
prevent backflow, the pump will do that, but to prevent forward flow unless
the pump is turned on. The Facet pumps I have will flow forward whether
they are on or off. A checkvalve that requires just a little
cracking pressure will prevent forward flow. High pressure positive
displacement pumps don't have this problem.
Bob Darrah
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