Review on 🔧 6.5L Pneumatic/Manual Oil Extractor Pump for Automotive Fluids - Efficient Vacuum Evacuation by Wayne Martin

I've seen about a dozen videos on how to use this item and it all seemed pretty easy. The first thing I noticed was that there were no instructions in the box, not even a packing list. I assembled everything, hooked up an air compressor and watched it pump out about 1.5 liters of oil, which is when the nightmare began. Nothing happened so I think it's done, but when I lift the canister I can feel the weight. And then I noticed that it was only pulling out about 1.5 liters of oil, when I tried to pump further the unit started. blew the oil back into the car and squeezed it out of the dipstick hole and so on everywhere. I don't even know how it happened. To make matters worse, I now have about a quart of oil that I need to get rid of before I can get it back. I feel like I'm missing something, like a directional control valve or something. I still watch videos to see what I did wrong but in the end it's just a defective product.