OK, All this time I've been heading toward EFI, Now I'm hearing EFI
is
perhaps not a good choice. So here is my question to all. What are
the
major problems with the plumbing? Should a certain material be used
for
the plumbing? Paul why is it you stated the homebuilder probably
can't
make a reliable plumbing system for the high pressure EFI system?
T.W.
----------------------------------------------------------
He can make it all right. It is designing it seems to be
a problem. In other words making decision on where to put what
seems to be the problem. Fuel pumps, selector valves, vents, etc.. If
you
are installing a Lycoming those decisions are made for you. Each type
of airplane is different so therein lies the problem. High pressure
EFI fuel systems are not as easy as they look. People make big
mistakes.
The other thing is high pressure pumps suck a lot of amps.
Too bad they are not as good on sucking fuel :)
So now the electrical system becomes slightly more important.
On the other hand low pressure none return carburetor fuel
systems are pretty straight forward. The low pressure electric
pumps are not finicky and have been around for decades. It
is also possible to get a mechanical fuel pump without too much
trouble. The old diaphragm mechanical pumps were positive
displacement and would suck the chrome off a bumper.
In effect the carb float bowl acts like a small fuel sump and
covers a few sins.
Now what kind of airplane are you building?
BTW one of the reasons the crash rate is higher for low wing
airplanes is fuel management by the pilot is more complicated
in low wing airplanes.
Paul Lamar ...No rotor no motor.
Paul and All, I'm building an RV8A, leading edge fuel tanks, the
attached photos are of the Fuel pump bracket for intank installation.
This is in the design phase and the clecos are only to set it up.
Please review and comment. I don't want to build something sub par. I
think we can come up with solid designs to address the EFI issue. Fire
away. Thanks T.W.
Nice work Tom.
I think you need two pumps in each tank. Lets say you run one tank empty.
You are now down to no back up fuel pump.
Paul Lamar ...No rotor no motor.
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