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Originally Posted by WB9MCW
Have you determined if your vac pump is constant on this would indicate a leak and pull to investigate further--sorry to say if that is the case.
lets see what the others say!
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Vacuum pump would not run if vacuum leak is present in the manifold. It's only concerns are holding the secondary system at a 12" minimum.
John and you can slide your hand back behind the motor and grab a hold of the map sensor hose and connection with out removing anything. just make sure the motor is cool.