|
Group FWIW
Call it a sump or header tank, if its large enough say 3
liters oops! I mean quarts with both pumps picking up fuel at the
bottom 1/4 of the tank with the fuel return pointing at the cover to
avoid aerating the fuel in the header (possibly a baffle below it &
a vent pipe to each tank) Gravity feed would work in a high wing , in a
low wing I think you still need a low pressure transfer pump to push
fuel to the header tank from the mains. I don't think it is safe to
have "Both" position in the fuel selector except in a gravity system
with carburetors, not with EFI, the possibility of "sucking air "is
unavoidable without check valves ( more weight, more cost & more
possibility of problems).
Georges B. ( Not really stirring the pot, maybe just a
little)
-------Original
Message-------
Date:
05/29/05 17:42:01
Subject:
[FlyRotary] Re: will EFI pumps pump air was Re: Fuel Tank Selection
Now I'm not so worried, because each
high pressure fuel
pump draws from it's own tank and the only point of inter- connection
is where the lines join at the fuel rail(s).
This brings up a question that I've had before, and I'm not
sure this is exactly what anyone is doing, so it's not meant that way.
Say you have two tanks, with an EFI pump for each tank. You
then connect the output of each pump together, feeding into one line
running to the fuel rail. The question is: What happens when one
tank runs out of gas? Will the EFI pump move enough air through it to
disturb the fuel rail pressure that's being delivered from the other
pump, or would it just stop pumping at that point, and do no harm
(other than maybe burning the pump up eventually)?
Yep, still trying to
figure out how to fix my fuel transfer system.
Cheers,
Rusty
|