What action must be taken after the cylinder has been filled and pressurized at the vehicle container installation?

After filling and pressurizing a CNG cylinder at the vehicle container installation, it is essential to check for leaks to ensure safety and prevent any potential hazards associated with gas leaks. Using a non-ammonia soap or a leak detector specifically designed for gas is the most effective method for this purpose. This type of soap creates bubbles at the site of a leak, allowing for visible confirmation that gas is escaping.

This step is crucial as it verifies the integrity of the connections and the cylinder itself after being filled. It is a standard practice in the industry to ensure that there are no leaks before the vehicle is put back into operation. Checking with water or performing a visual inspection may not be as reliable since they might not effectively indicate gas leakage. Additionally, while using a pressure gauge can help assess the system's pressure levels, it does not provide a direct check for leaks.