The Purple hoses are the vents to the top of the diaphragm. These must be vented. It's also important that the filter you use flow enough air. If it doesn't, it'll do weird things to your jetting. You'll get surging, hesitation, and it'll run really rich. bad bad bad.

The green hoses are the carb float bowl vents, and they should be kept open. They don't need to be filtered. There's a service bullitin to cut off 3" inches from the end of the hose. Doing so fixes the 2 O'Clock cross-wind stumble/stall problem.