I guess this is more of a Cozy question than a rotary question.

     Is the problem, fuel starvation from a long banking turn and all of
the
     fuel flowing toward the wing tip of the low wing and away from the
tank
     sump? Or is there also a problem with a long decent and the fuel
moving
     forward of the fuel pick up?

Steve,

It's not a cozy or a rotary question, but one of flight in general.

You can bank forever, if your turn is coordinated, your fuel will stay
in the same position relative to the aircraft as it was before you
started the turn. ('That's why you don't fall out of the plane, or
scooch to the door when you turn.

Witness Bob Hoover being able to pour  water into a  glass placed on the
glairshield as he does a roll or loop.

The only difference in the fuel system would be an increased fuel
pressure because of the centrifugal force created by the turn.

I can't speak to the descent, that depends on the angulation of the
plane, with respect to the vector of gravity, the location of the fuel
intakes and amount of fuel onboard , as you descend.

Rich



Of course, I am confused by all of the opinions out there and all of the
bad info mixed with the good on the internet.
Fuel lines out of the tanks, run forward to the console to a fuel
selector, then the main line run aft to gascolator with quick drain,
then dual pressure pumps, then through the firewall to a filter then to
dead-end fuel pressure regulator and fuel rail. If I keep fuel exposure
to heat at a minimum, can this work or am I way off?

Steve

I don't think you can dead end the fuel pressure regulator.
Watch out for the fuel selector on the Andair valve as the detents
are not strong. Put it some place so you can not inadvertently move it with your
knee or some such. I investigated a fatal crash and that could have
been a factor.  Bulents two level brass valve works great but it
is a bit heavy.

Use positive displacement roller vane pumps and not the stock automotive
kind. Roller vane pumps will prime on their own when not mounted on the
bottom of the tank. Stock automotive pumps are designed to be installed
inside the fuel tank as is the Walbro even though you can get external versions.
They don't suck well.

Several people have had good luck with the TWM
pressure regulator. I just check one for vacuum leaks on Marks engine and the vac leak
was minimal. More than I can say about some other brands we have tested.