Check the condition of the rubber connector and the plastic line going
to the shutoff, and the condition of the connection of the supply line
at the main vacuum line.
All that plastic line gets brittle, and it's not than unusual to flex
a portion of it when working on something else and have it crack part
way through, giving you a vacuum leak.
The rubber rots, too, and flexing it can cause it to leak.
Peter
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