by Skippydiesel » Mon Dec 25, 2023 3:40 am
Follow UP
I was still not happy, after installing a smaller return line restrictor jet, with the pressure in my fuel delivery system.
While the aircraft was back in my home workshop, for cooling system modifications, I made some changes to my fuel delivery set up.
Previous - Boost Pump only worked on selected Wing Tank. There was no bypass on the Boost pump - so if blocked/restricting flow, no alternative flow rout. Largest tank Centre tank also had the fuel return line supplying it.
Changes:
Higher capacity Facet Cube Boost Pump fitted as per RV advice (Old: max 5 psi / New: Max 7 psi)
Boost Pump will now draw from selected Wing or Centre Tank - Take-off, Climb Out & Landings can now be safely done on the Centre Tank.
Boost now has a bypass fitted with non return valve.
#35 Fuel return line restrictor jet re installed, in recognition of new Boost Pump higher Max pressure
Improvements in fuel pressure readings all round BUT still getting an alarming drop in pressure, when Boost Pump turned off, before presser then rises once more to an acceptable level.
Have gone back to smaller restrictor jet - will report findings after next flight.