FOXWELL ST203 12V Automotive EVAP Smoke Leak Detector

Pinpoint Vehicle Vacuum and EVAP Leaks with Confidence

The FOXWELL ST203 Automotive Smoke Machine is a 12V diagnostic tool designed to help you quickly locate leaks in EVAP, intake, vacuum, exhaust and other closed automotive systems. Powered directly from a vehicle battery and equipped with a built-in air pump, it produces controllable smoke and pressure so you can see exactly where air is escaping. Whether you are maintaining your own vehicles or working in a workshop, this smoke leak detector offers structured, repeatable testing without relying on an external air compressor.

ST203 supports most 12V vehicles, including cars, SUVs, light-duty trucks, motorcycles, ATVs, boats, RVs and more. Dual operating modes allow you to test with air only for rapid confirmation of leaks, or switch to smoke mode for visual leak tracing. A built-in pressure gauge and dynamic flow meter display leak status in real time, while the adjustable flow control lets you tailor smoke output to the system under test. The unit is designed for extended work cycles and controlled temperature rise, helping to reduce oil consumption and load on the vehicle battery during repeated tests.

Included in the package are practical accessories for sealing and adapting to different openings: intake adapter cone, inflatable adapter, air drum rubber and a full set of 23 cap stoppers. A hook, funnel, power cords and user manual support straightforward setup and storage. With a simple three-step operation-add smoke fluid (not included), connect to 12V power, and start the test-even first-time users can perform systematic leak checks on EVAP systems, intake manifolds, turbo piping, fuel tank vents and other smoke-sensitive circuits while following the safety guidance provided.

Why It's a Smart Choice

• Built-in air pump and dual air/smoke modes remove the need for a separate compressor and simplify leak diagnosis on the vehicle.
• Pressure gauge, flow meter and adjustable smoke output provide clear, real-time feedback for locating both small and large leaks.
• Comprehensive accessory kit and 12V battery power make it suitable for a wide range of vehicle types and test scenarios in the workshop or on-site.

FAQ

Q: Which systems can I test with the FOXWELL ST203?
A: It is suitable for EVAP systems, intake and vacuum lines, turbo and intercooler piping, exhaust sections, fuel tank vents and many other closed automotive pipe systems that can safely be exposed to low pressure and smoke.

Q: Do I need an external air compressor?
A: No. The ST203 has an integrated air pump. You only need a fully charged 12V vehicle battery and compatible smoke fluid such as mineral oil-based baby oil.

Q: Is it compatible with every vehicle model?
A: It supports most 12V vehicles, but not every model or system configuration. If you are unsure, check your vehicle documentation or confirm the application with the seller using your vehicle make, model and year.

Q: How do I use it safely?
A: Always test with the engine off, keep smoke away from sensitive components such as headlight housings, use only low-density mineral oil-based smoke fluid, and follow the temperature, run-time and filling limits described in the user manual.