I'm running 1/4". With 4 wing tanks, tube from tip tanks to wing root is aluminum, rest rubber. I have space between floor and belly where I mounted pumps and pressure regulator on a header tank so I don't have to return fuel to wing tanks and only 1 line going forward to motor. Not flying yet but just finished fuel system. I put some fuel through it yesterday to check for leaks, didn't do an actual flow test but it is plenty fast enough with those pumps that Tracy sells. I think that the big hose theory is from the carby days, not really applicable when you add a efi pump to the system. How I convinced myself 1/4" was ok, was to lay about twice as much hose as the plane needs on the workshop floor, put a pump in the middle of it, a full tank at one end and an empty at the other and let the pump transfer it, can't remember the flow rate but it was more than adequate. Kind Regards Andrew Martin Lightwing speed 4000 Renisis
OK, 2 questions.
1. For those using Floscan fuel flow transducers:
Anyone have a floscan 201 sensor that's working ok while mounted
in other than a horizontal position? My most convenient location
would have the fuel path flowing up at a 45 degree angle. In
addition, the mounting can have the wires 'up', but mounting
would be a bit more convenient with the wires pointing
horizontally.
2. While researching Q1, I found a note from the guy who makes
Airflow Performance fuel injection systems for Lycs (they run at
around 15-30 psi), recommending 1/4" (AN-4) fuel lines firewall
forward to minimize fuel heating & vapor lock. I've already
been tempted to consider this instead of -6 (saves weight,
running lines is easier, etc) because the injection pumps &
automotive systems use small diameter lines, but was reluctant
to go against 'convention'. Has anyone who's flying an injected
rotary used -4 fuel lines to feed the engine?
Thanks,
Charlie
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