What type of fuel distribution line is allowable inside an engine compartment?

The correct answer is USCG Type A1-15 for fuel distribution lines inside an engine compartment because this type of hose has been specifically designed and tested for use in environments that are exposed to the highest risk of fire and fuel leakage. Type A1-15 lines are constructed to handle fuel without degrading and are resistant to permeation by fuel vapors. They also have a high burst pressure rating, making them suitable for high-pressure fuel systems often found in marine engines.

This regulation is set forth by the U.S. Coast Guard (USCG) as well as the American Boat and Yacht Council (ABYC) standards, ensuring safety and reliability in engine compartments where there is a significant risk of exposure to flames or heat. A1-15 fuel lines are reinforced and can sustain flexing or vibrations that occur with typical engine operation, contributing to a safer boating environment.

In contrast, other types of hoses, such as Type B1-10 or non-flexible lines, do not meet the stringent requirements for engine compartments and may be unsuitable for the rigors of a marine engine environment. Type A2 lines are also designed for fuel systems but have different specifications and may not be permitted in all applications. As such, using the correct type of fuel