Review on 🚗 Car Fuel Leak Detector EI009G - Automotive Fuel Pipe System Leak Tester with EVAP System for Cars, Motorcycles, Snowmobiles, ATVs, Light Trucks, Boats by Ben Alvarez

I had an air leak on my Audi. I checked all the vacuum lines and couldn't find the fault. I put some mineral oil in here, attached an air compressor hose to it, and inserted a smoke tube into the oil dipstick tube. A few minutes later I began to see smoke coming out of one of the variable valve timing solenoids. It turned out that the o-ring was hard and brittle and did not close completely. Definitely did the trick. I don't know how else I would have found this leak.