Avoid touching electrical switches or appliances, when a leak is suspected. In case of a leak, go to your propane system's storage vessel, open the tank hood, and close the vapor service valve. Then, contact a qualified technician for assistance. Electronic leak detectors are available. Contact your nearest propane retailer for the purchase of a detector.
Propane is heavier than air.
The vapor will descend to the lowest point, for example, your basement. Avoid these areas when a leak is suspected. Never tamper with your system's supply lines. Never tamper with and safety devices, regulators, or storage tank fittings. Never use an open flame, to test for propane leaks.