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When you start up the engine do you see a lot of black smoke from the exhaust???

May have to think outside the box. Is the vacuum system somehow connected to the engine crankcase ventilation????
Is the petcock somehow leaking and/or fuel being sucked into the vacuum system????
There is a thread in the Step by Step about flipping the vacuum diaphragm/spring to allow fuel flow without vacuum. There is an air vent
between the diaphragms, if it is blocked anything could happen.

Weird chit happens..
 
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