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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
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