PITOT-STATIC SYSTEMS
There’s a lot of good information in your DIY pitot-static system troubleshooting article in the October 2022 Aviation Consumer. I’ve done leak tests myself and the setup can be very simple.
Most folks can easily draw the required vacuum with their own lungs. My setup consists of a length of “firm” polyurethane tubing (1/8” inside diameter) with a one-way valve at the end. Near that end is a tee with a needle valve connected. The open end of the tubing is sealed to the static source opening with vacuum bagging tape, and the tubing is long enough that I can sit in the cockpit with the one-way valve to my lips as I watch the altimeter. I draw to slightly above— and start timing—as it passes 1000 feet on the way down. I use the needle valve to release the vacuum gradually, so as to not risk damage to the instruments.