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Wise Auto Tools: What are smoke machines used for in relation to the automotive repair industry? Smoke machines are commonly used in the automotive repair industry to locate leaks in a vehicle's evaporative emission control (EVAP) system. The EVAP system is responsible for preventing fuel vapors from escaping into the atmosphere and it typically includes components such as the fuel tank, fuel lines, and charcoal canister. When the EVAP system has a leak, it can cause a variety of issues, incl …