If RV technicians had a Top 40 list, a timed pressure drop test would certainly be a recurring hit. If you’ve ever hired a mobile RV tech to repair or replace a gas-fired appliance, then you’ve likely paid for a pressure drop test. In fact, many technicians conduct a gas leak test anytime a gas-tight connection is disassembled. It’s a stock test in the trade. But what is it exactly, and why would you need one? 

The Obligatory Propane Safety Disclaimer

This is not a tutorial or instructional. In fact, I’ve avoided providing step-by-step directions on how to conduct an RV timed pressure drop test. There are other resources available if you wish to learn how to safely and professionally conduct this test. You will need to invest in a manometer, a leak tester, and a custom-made brass tap jig. My RV Works has a great video on how to make your own.

If you’re new to the world of propane, I recommend starting at my RV 101: Introduction to the Propane System. But in this article, we take a closer look at pressure- and leak-testing. This is required if you install a new appliance, disconnect an old one, install a new propane tank, suspect any mechanical damage to the system, think you smell a gas leak, or have a beeping propane alarm.