I JUST BOUGHT A 1998 38 SCARAB,IT APPEARS IT HAS ONLY ONE TANK BUT HAS 4 PLACES TO FILL IT UP,IN THE ENGINE ROOM THOUGH THERE IS 8 FUEL VALVE 2 AUX FOR PORT MOTOR,2AUX FOR STARBOARD MOTOR,1 MAIN FOR PORT AND 1 MAIN FOR STARBOARD,THATS 6 VALVES THEN THERE ARE THE 2 THAT SUPPLY THE FUEL DIRECTLY TO THE MOTORS.WHAT I NEED TO KNOW IS WHICH FUEL FILL GOES WITH WHAT VALVE?THANK YOU