I have a question for people with electronic fuel injection systems.  My
question involves the tank setup and return lines.   On a Cozy with a 20b.
I have a sump tank and I planned on having check valves between the wing
tanks and the back seat sump tank. ( I am using Infinity retracts )  I'm not
using a tank selector valve.  Only a fuel system on/off valve.   I want it
simple yet right.  I have 1/2" stainless tubing between the tanks and 1/2"
outlet from the sump.  Now I'm concerned about the return line from the Fuel
Injection.  Will the pressure of the heated return lines keep the check
valves from allowing more fuel into the sump?  I plan on a vented system in
all tanks but then worry that any pressure could push fuel out of the sump
vent line.  I planned on having possitive air pressure on the vent lines
during flight by facing the outlets into the wind or "jetstream"

I've got notes from other past questions on this group that suggest the
check valves but I'm not sure they are using EFI and I wonder where they are
returning the fuel.

Rick Irwin

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