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< I had the issue of a the pressurized lines being
< perfectly sealed.
So, in the future, if you have a bad injector you
don't want to know about it? I'd want to be able to smell that fuel leak and
replace the defective injector. I would not want to mask it.
-al wick
----- Original Message -----
Sent: Wednesday, August 17, 2011 8:22
AM
Subject: [FlyRotary] Re: Dennis Haverlah
Fuel System...or any others, for that matter.
Al Wick wrote:
> I'm really concerned for some of these
fuel designs. The fuel bleed has
> nothing to do with vapor lock.
Virtually no effect at all.
>
I don't know why others are
doing it, but for me, the bleed has nothing at all to do with vapor
lock. Some
conversations have been mixed together, so I can see how
that could be the impression. The point of the pressure bleed
is to
bleed off the pressure after shutdown.
I have a strong, positive head
pressure going into my pumps. They, and the regulator, are about 8"
directly below the
tank. Excess fuel goes back to the opposite side
of the tank from the pickup, and a single line goes forward to feed
the
injectors. The fuel lines are arranged such that heat soaking the lines
to the point of boiling the gas will push
liquid fuel down hill and behind
the firewall, isolating the gaseous gas with its heat at the top of the
line. Turning
the pumps on will pressurize the line to 55psi,
returning most of the gaseous fuel back to a liquid state. The ECM is
programmed for a longer clearing pulse on hot start.
The point of
the bleed is to allow fuel to move back to the tank. I had the issue of
a the pressurized lines being
perfectly sealed. The pressurized fuel
was finding the path of least resistance out, which just happened to be out
the
injector and into the intake manifold where it sat as a little
puddle. Heat soaking the lines would not push liquid
fuel downhill
and back behind the firewall. It would push more fuel into the
manifold. A puddle of gas sitting in a
composite manifold, just
above a hot exhaust stack is just bad mojo. A poorly sealed regulator
allows the pressure to
bleed off in about 5 seconds (give or take),
isolating the hot fuel in front of the firewall, and keeping the rest cool
and out of the intake manifold.
Got nuthin' to do with vapor
lock.
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