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Super Moderator
161 Posts
That video doesn't tell much.
If it's sucking air, there is a leak somewhere on the suction side of the prime bulb.

A fuel line is nicked, cracked, loose, or shrunk, or the fuel lines are plumbed incorrectly.
The priming bulb is defective or installed incorrectly.
There is a defective gasket in the carburetor.
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