THE FUEL SYSTEM IS FOR 6 AUXILIARY TANKS.  I ADD 2 TRANSFER PUMP WITH 2 PRESSURE SENDER AND 2 SELECTOR VALVES. I SPLIT IN 2 PARTS  AND I CALL "LEFT &  RIGHT. EACH PART HAVE 1 PUMP & PRESSURE SENDER & SELECTOR VALVE. THE SELECTOR VALVE CAN SELECT  1 WING TANK, 1 TIP TANK, 1 CONFORMAL TANK WITH 1  PUMP IF I HAVE 1 PUMP FAILURE I CAN MAKE A CROSS-FEED. ALL THIS TRASFER TO THE MAIN TANK