Skip the safety check and maintenance on your barbecue grill, and you could be playing with fire. At the start of grilling season, inspect the hoses for cracking, brittleness, holes and leaks, and replace the broken grill parts if necessary. Check for gas leaks by mixing a small amount of dishwashing liquid and water in a spray bottle. Spray the solution over connections and along the hose, then turn on the tank. Bubbling means you need to change a part or fix a loose connection on your barbecue grill. Follow the directions in the owner's manual and regularly clean the grill [1], especially the grease trap, and make sure the gas supply tubes are clear of spider nests and debris.
Links:
[1] http://www.moneypit.com/question-and-answer/gas-grill-cleaning-tips