The vacuum advance does not know the different between positive pressure and zero pressure. In fact, it responds to them the same way. When your turbo/supercharger beings to produce positive ...

The Milwaukee Vacuum Pump kit is one of several highly regarded Milwaukee products on the market. Here's how the pump works, ...

In fact, I believe it is more reliable than using a standing vacuum test typically performed after evacuation. Pressure testing a system with dry nitrogen tests the system under a positive pressure, ...