coughing 503 dual

[Junkie]

Good news Greg..

I also just sorted an issue where one carb was empty and the other normal, discovered a kinked fuel line from the pump - this AFTER my so called "pre-flights" - obviously kak an in a hurry
electric pump saved the day again

Have rerouted fuel lines (Blue) again to ensure this dont happen again (i realy thought id done a grand job the last time !!)

... simplest things will get u

[Griffin]

Niren
It sounds as though the float bowl on one of the carbs was empty. I would check the float, needle and seat.

[Griffin]

... or a kink in the fluel line

[Aviation Engines]

I've also come across fuel lines that that over tightened causing a crease in the line resulting in the sucking in of air. I may not leak since it's a suction line.

The impulse line from the pump to the crankcase should be as short as possible. the breather the on the pump must face upwards or sideways, never down.