verslagen1
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The petcock is vacuum activated, the only time you have vacuum is when the engine is running. When the engine isn't running, no vacuum, petcock is off when set to 'on' or 'res'.
When the petcock is set to 'pri', gas will flow regardless whether the engine is running or not.
If you think your petcock is leaking thru the diaphram, remove the vac line and cap both ports. Gas might leak thru the diaphram down the vac line pouring gas into your engine.
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