Hi CMpilot1,
since gravity fuel is not possible using cross-feed.
I disagree. See FCOM, PRO-ABN-28 Fuel, Gravity Fuel Feeding.
"F NO FUEL LEAK AND FOR AIRCRAFT HANDLING:
If no fuel leak, and for flight with only one engine running (this engine being fed by gravity), apply the following :
FUEL X FEED...... ON
BANK ANGLE...... 1° WING DOWN ON LIVE ENGINE SIDE
The fuel from the wing tank on the engine running side is used.
RUDDER TRIM USE
Use rudder trim to maintain constant course and neutral stick.
WHEN FUEL IMBALANCE REACHES 1 000 kg (2 200 lb):
BANK ANGLE...... 2° or 3° WING DOWN ON LIVE ENG SIDE
Use fuel from the opposite wing tank, until fuel imbalance is reduced to 0."