What is a critical sign of a gas leak in an LPG or CNG system?

A critical sign of a gas leak in an LPG or CNG system is the presence of a distinct odor that is often added to the gas for safety. Natural gas, including both liquefied petroleum gas (LPG) and compressed natural gas (CNG), is normally odorless; therefore, an odorant, usually a substance called mercaptan, is deliberately added to help identify leaks. This distinct odor is commonly described as resembling rotten eggs or sulfur, making it easier for users to detect any escape of gas. Recognizing this odor is crucial for ensuring safety, as it provides a clear indication of the need for immediate action to address the potential hazard of a gas leak. Awareness of the added odor is a fundamental aspect of gas safety practices.

In contrast, a sweet smell would not typically indicate a gas leak as it does not match the odor of the gas. Silence in the system does not provide any indication of a leak, nor does it suggest a risk, as leaks can still occur even when the system is not making noise. An increase in engine power is unrelated to identifying a leak, as it pertains more to engine performance rather than safety concerns.