Troubleshooting New Air Gun

I'm not entirely sure what you mean... but, as a point of reference, the kit I bought is the RoadPro kit that was on sale at Flying J.

Vacuums are better at cleaning the dust that accumulates on the floor and what have you, but they're a little useless when it comes to getting the dust out of the air intake vents on my laptop and electrostatic cooler.

As to the leaking, the air gun nozzle is leaking where the plunger depresses into the housing of the gun. It's also leaking a little at the brass fittings that clamps onto the hose that supplies the seat.