Check propane connections by applying a commercially prepared leak solution, available at propane suppliers, to any joint suspected of leaking. If no commercial product is available, use a thick solution of soapy water. If bubbles form at the connection, turn off the propane supply and tighten the connection, but avoid over-tightening. Repeat the steps until the solution does not bubble when the gas valve is open.
Propane leaks are dangerous, so distributors add special chemicals with an offensive odor to propane so leaks are readily recognizable. Without this odorant, propane is colorless, tasteless and odorless.
Distributors offer kits that help customers learn the smell of the chemical. If you smell propane in a house, immediately evacuate the house without activating any light switches or lighting any matches. Call for help once everyone is safely outside.
Propane is heavier than air and collects in the lowest level available. If you think you smell the gas, get on your hands and knees and sniff near the floor. Existing odor is strongest there.
Propane detectors offer another way of detecting leaks. They sound an audible warning if they detect propane in the area. The detectors can still identify propane in the rare event that the odorant is not present.