It has a built in regulator so you can smoke test your evap system without damaging it. smoke machines for cars can be used to find leaks in the power steering system, a/c system leak, evap system ...

As part of a vehicle’s emissions control system, the EVAP (evaporative emissions control) system traps fuel vapors from evaporated fuel. The system then sends the fuel back to the tank for use.

But there are lots of valves inside the evaporative emissions system that leak, too. The smoke machine will help you figure out exactly where it's coming from. Have a question about cars?