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I disassembled the unit to inspect the bulb and fuel lines. Both are fine, not cracked and hold pressure.

When I press the bulb I hear a whistle in the tank, see bubbles, but nothing goes to the bulb.

My next step is going to be compressed air to the carb.

Suggestions?? Thanks!

1) DO NOT PUT COMPRESSES AIR ANYWHERE NEAR A CUBE CARB
If the bulb returns quickly then the fuel line is broken between the filter & the carb and you are just sucking air into the carb then blowing it back