Can not feel vacuum on vital injector 2 ???

Vital injector 2 comparing with the first generation add the filter function
it means dose do not waste will reeturn to machine through filter, at the same time filter block dirty access machine.
When we testing the machine do not feel vacuum pressure on the connective port with needle,
but you can feel the vacuum on the whole use to set filter.
Before using the machine please test all function first and lean how it work.
In normal, all recommend adjust the vacuum to highest, that's level 5

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