So yellowbird, what cracking pressure is needed in a non return valve?
I'm glad you told us why we turn the prime pumps off after engine start, do you know why we may need to turn them on in flight?
My statement merely highlights the questionable action of placing an obstruction such as a nrv in a crucial fuel line if it wasn't needed
And also SS,... i've been reading a lot of posts of you lately, and also quite some replies to your posts, and I believe I've come across the word 'arrogance' more than once. Must be a reason for that
Yep, because I question things
Such as, when you say;
Is this creating some swirl effect in the supply tank.....when you suddenly stop the supply from the transfer pumps; the swirl will continue for a couple more minutes, creating static pressure drop at the exit of the fuel transfer line, and thus continue pulling fuel from the main tank.
Do you consider it arrogant of me
(expecting the obvious answer) to highlight an earlier post;
"Phoinix; We had exactly the same; 159 till 139 after XFER pumps OFF, sucking at it for almost 15' before supply tank indication dropped."
My, thats some swirl effect going on!