Russell,

 

It depends on the engine RPM, but for my TSIO-550E at 2300 RPM, I see 14-15 PSI (at the intake manifold tap) in this altitude range. I do not have the altitude compensating system.

 

If you are having difficulties, I was advised by a fellow Lancarian (I am very sorry that I can’t recall specifically who told me this) at AirVenture that the stainless braid-covered hose provided by Lancair for the wing to fuselage connection leaks considerably after only a short time. I have not had any issues with my airplane in two years of flying until recently, but have very recently had a couple of “roll backs” at these altitudes. Low boost fixes this, but I can’t wait to pull these hoses and test them for leaks. I also intend to test the system “end to end” with a small hand-held vacuum tester. Be sure you’ll hear from me if I find any leaks in the system..recalling that a leak would introduce air bubbles into the system as it operates in a vacuum/suction mode until the fuel pump…

Bob

 

 

What fuel pressures that you are seeing at altitudes from 10 to 15,000 feet with the fuel pump off for a continental io-550?

 

Thanks

Russell Steiner