Today's Message Index:
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1. 04:14 PM - fuel (Gary Gerber)
2. 05:12 PM - Re: fuel (LRE2@aol.com)
3. 06:02 PM - Re: fuel (HMS23TURBO@aol.com)
4. 07:30 PM - Fuel system (Robert Oliver)
Message 1
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--> FEWMustang-List message posted by: Gary Gerber <44gn@kconline.com>
Hi guys...
Can't remember who told me about the fuel return line if you have fuel
injection motor. Question.. where does the return line go in to the
fuel tank? The same area as the pick up or to the top of the tank?
Gary
Message 2
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--> FEWMustang-List message posted by: LRE2@aol.com
Gary,
I'm hoping that Ed will join in on this one, because he is by far and
away the expert. I think that you need to determine the fuel injection system
that you are going to use. AirFlow Performance is probably the standout in
this area. They provide a number of acceptable plumbing diagrams for managing
the "Return Flow"
which I understand to be the fuel that is over pressure, and thus must return
to the Tank.
Where ever you decide to return this fuel It would seem to be best to
return it to the top of the tank, rather than the bottom LRE
Message 3
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--> FEWMustang-List message posted by: HMS23TURBO@aol.com
Gary,
My feeling is that it is always the best if you can return the fuel to an
area that offers the lowest back pressure or head pressure; normally the highest
point practical.
A little of this depends upon how your tanks flow; outer to inner on each
wing half via gravity or you may have completely separated them and can switch
between all four independently. If your tanks flow together and are simply
joined at the baggage / gun bay access, as is the prototype, the inner tanks will
always be fairly, if not completely full and have "head pressure" on any return
port location on the inners until the outers have been consumed, thus keeping
any return port underwater, so to speak, until the inner's fuel levels have
dropped below this point. It's not practical to return the fuel to the wing
tips, so the rule of thumb would be is stick with the highest point available on
the inners. With the Airflow Performance system any place will do, as the fuel
is returned in this system under pressure; pressure higher than the pressure
in your properly vented tanks will ever be. The Airflow system doesn't read or
need the data from the amount of returned fuel so don't worry about damaging
any signal the system needs by returning it to a "covered return port". If you
choose to use the LS1 / LS6 Chevy and it's fuel system, there is no return
from the F.I.. If you are planning to use another type of F.I. let me know, and
I'll be glad to look at it's needs for you. My advise is to put the return
where you can do it with the best integrity and plumb it practically. The center
or top of the tank, either one, it won't really matter much here. Keep it
simple!
Ed
Message 4
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--> FEWMustang-List message posted by: "Robert Oliver" <rocslo@charter.net>
Gary: I agree with Ed H., it really depends on the fuel injection system used.
I have the Airflow Performance unit on my engine and I return the fuel back into
the feed line per a drawing # 6 that I got from airflow performance. They
show a system of returning the fuel back to both tanks or as an alternate, back
into the feed line from the fuel selector to the fuel pumps. I set mine up
to feed back from the regulator bypass into the fuel line between the fuel selector
and the dual fuel pumps using all 3/8 tubing. The advantage to recycling
is that you are not returning the fuel to any particular tank and thus keep
a handle on fuel usage. Just as a general note, I burn about 19 GPH on take
off power (4500RPM) then am down to about 11.8 GPH at cruise power of 3400 RPM.
In 167 hours of flying, I have had zero problems with my Airflow system.
Robert
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