proper way to strain crossfeed?

[N8632Y]

appreciate any help on procedure here. Thanks in advance...

I own a twinco, and my question is on straining the crossfeeding?

Looking at the diagrams of the fuel system, my right tanks, main or aux, will have a line going thru the fuel strains, which for me, I believe is the rear or aft strainer, and I pull the red knob up for the specified time.
The crossfeed line goes thru both strainers, it appears?

So if I place the left selector on main, and the right on crossfeed, then I would assume you strain both right and left sumps?
I when in doubt would strain both, but any thoughts?
steve

[N3322G]

Hi Steve,

The Maurice Taylor DVDs from CFF go over this, I believe and here's the process I/we use.

Before first flight
Both selectors on main
Lift aft or right red button and sump main
While holding red button up, change to right aux and sump
While still holding red button up, change to right crossfeed and finish sumping
Return right fuel selector to main

Then lift forward red button and sump left main
While holding red button up, switch to left aux and sump
While holding red button up, switch to left crossfeed and finish sumping
return left selector to main

At the end of the day
I sump right and left mains and auxes but pass the crossfeed.

Of course, tips and other tanks are extra effort but I only sump when I have fuel in them.

The maintenance shops have told me the Twin has really clean screens whenever we have the 50 hour AD done since I've been sumping this way. May be different since the selectors have been overhauled and two of four bladders died as a result of being left empty and untreated while the belly was being repaired.

Hope this helps and if others have different processes, I'd be interested.

I forgot to mention that if we see contaminants in the fuel, then we drain the tanks one at a time and check the results after each drain to know where the junk is coming from.

[jeffrey aryan]

Pat,

Could please explain or reasoning why you suggest holding the Red button up while switching tanks ?

I have never heard of that procedure.

Thanks,

Jeff

[AlanBreen]

[N8632Y]

[N3322G]

[AlanBreen]

[N3322G]

[N8632Y]

[N3322G]

[John Wasserburger]

[N3322G]

[AlanBreen]

[Diller]

[N3322G]