What readings will be obtained when an analyzer probe is placed near a fuel line leak?

When an analyzer probe is placed near a fuel line leak, the readings obtained will primarily show hydrocarbons (HC). Fuel leaks release fuel vapors that are rich in hydrocarbons, as gasoline and diesel fuels are composed of various hydrocarbon compounds. Therefore, the presence of a leak will result in a significant increase in HC levels detected by the analyzer.

Carbon monoxide (CO) is primarily produced during the combustion of fuels and is typically found in exhaust emissions. Since the question pertains to a fuel line leak, which is an issue of unburned fuel vapor rather than combustion, the levels of CO would not be expected to increase significantly in this scenario. Consequently, while CO may be present in some context, it is not the primary concern near a fuel line leak.

This understanding helps to clarify that only HC readings will be significant in this case, as they directly relate to the type of emissions present due to the fuel leak, whereas CO would not be a meaningful reading in this specific context.