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I'd worry about the condition where the transfer tank was empty (air leak
through Facet). They are not "air-tight".
Tracy
----- Original Message -----
Sent: Monday, May 30, 2005 12:51 PM
Subject: [FlyRotary] Re: will EFI pumps
pump air
I'm 'T'ing the output of the transfer pump into the supply line
from
the main tank before the gascolator. The transfer pump will only
have
to overcome the head of the fuel, about 3 feet or so to push fuel
back
into the main tank. Is there anything I'm missing that would
keep this
from working?
Bob W.
On Mon, 30 May 2005 10:51:53
-0500
"Russell Duffy" <13brv3@bellsouth.net>
wrote:
> Will the EFI pump move enough air through it to disturb the
fuel rail
> pressure that's being delivered from the other pump,
> I would say yes
>
>
>
I'd bet that you have a 50-50 chance of being right :-) Seriously,
I'm not
> so sure it would pump air well enough to overcome the 43 psi
of pressure
> that the other pump is putting in the rail. I guess
the only way to find
> out it to do the experiment. I'm not completely
sure that's what I want to
> do anyway.
>
>
Yep, still trying to figure out how to fix my fuel transfer
system.
> What's it look like now?
>
>
> Remember the recent caution about copying a system
100%, or it becomes a new
> system? Well, guilty as charged.
My system is just like Tracy's, except
> that I only have one return
line to my feed tank. I plumbed the wimpy
> facet transfer
pump into the same line that returns from the regulator.
> That means
the facet pump is trying to push against the return flow from the
>
regulator, and it's not doing too well.
>
> Even at
it's best, on the ground, with no other pumps on, the facet is slow.
>
In the air, fighting against one EFI pump's return flow, it takes a
long
> long time to see fuel moving. With both EFI pumps on, I
almost wonder if
> fuel isn't going backwards into the non-feed tank
anytime the facet wasn't
> on because the check ball isn't
perfect. I added a one way valve to stop
> this, and to stop the
fuel from leveling itself between tanks when parked.
>
>
> The obvious solution is to "simply" (NOT) add another hose to the
feed tank.
> Even if I go through all that hassle, I'm still stuck with
the slow rate of
> transfer of the facet. It's probably still the
best option, but I'm going
> to investigate every other option before
doing this.
>
> Rusty
>
--
http://www.bob-white.com
N93BD - Rotary
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