G'day all,
The long pipe is the pickup tube for the pump. Dunno if it's detachable on these plastic body carbs, but if the strainer end is hex shaped it should unscrew.
With the carb off the tank, it should be possible to blow air up it and feel it coming out at one of the diaphragm flap valve locations.
The short pickup is where the main jet lives, with its own strainer.
There are only three fuel passages in these carbs; pump in, pump out and main jet - so it should be possible to work it out, barring major manufacturing faults.
