Question

fuel lines supply fuel to the throttle body or fuel rail and return excess fuel and vapors to the tank. which of the following best describes fuel and vapor lines? a) pvc (polyvinyl chloride) b) copper or aluminum tubing c) seamed steel tubing d) rigid or flexible

Explanation:

To determine the best description of fuel and vapor lines:

• Option A (PVC) is incorrect because PVC is not typically used for fuel lines due to chemical incompatibility with fuel.
• Option B (Copper or aluminum tubing) is incorrect because these materials are not standard for fuel/vapor lines (e.g., copper can corrode with fuel, and aluminum is less common for this purpose).
• Option C (Seamed steel tubing) is incorrect because seamed tubing is not suitable for fuel systems (seams can leak or fail under pressure).
• Option D (Rigid or flexible) is correct because fuel and vapor lines can be either rigid (e.g., metal pipes) or flexible (e.g., rubber hoses) depending on the vehicle’s design and application.

Answer:

D. Rigid or flexible