I had a small leak on a 2004 Dodge Dakota’s evap system, I had replaced two parts on the system and still had the issue of coding for small leak. I looked at the hoses and placed clamps, but it still coded, so I bought this smoke machine, hooked it up to the Evap system, and within minutes the smoke showed the leak. I fixed the area, the check engine light went off an I am so happy. I look at this as an investment, I would have been charged more money for diagnostics at a repair shop than the cost of the machine. I highly recommend this product. It would be nice to be able to adjust the amount of pressure rather than pulling the smoke from the hose but it still worked, just be careful to not go over the PSI for the system you are testing. 2 Thumbs Up