From Longman Dictionary of Contemporary Englisha gas/oil/water etc leaka gas/oil/water etc leakPOURan escape of gas or liquid through a hole in something A gas leak caused the explosion. → leak
Examples from the Corpus
a gas/oil/water etc leak• The first reactor was closed down for repairs earlier this year after a gas leak.• But firemen confirmed the blast at 3.42am was caused by a gas leak from a water heater.• But responding to Nathan Bryce's flirting was about as wise as striking matches to find a gas leak.• The victim was slumped over a freezer where he had been searching for a gas leak.• That was the occasion when a gas leak caused an explosion which wrecked an entire tenement. 