What is checked about vacuum line routing during the inspection?

• A. Lines should be properly routed, supported, and free from wear or rubbing.
• B. Lines must be color-coded for easy identification.
• C. Lines should be heated to improve flexibility.
• D. Lines can be anywhere as long as they don't touch heat.

Answer: (A)

Vacuum line routing is checked to ensure the hoses are secured in a way that prevents wear, rubbing, and leaks. The hoses should follow a neat path, be supported or clamped to stay away from hot components and moving parts, and have smooth bends rather than sharp kinks. When lines rub against insulating wraps, sharp edges, or engine hardware, they can wear through or crack, leading to vacuum leaks that affect engine performance and emissions readings.

Color-coding isn’t required, and heating hoses to make them more flexible isn’t standard practice, since heating can degrade hose material. Simply placing lines “anywhere” isn’t acceptable if they risk contact with heat or abrasion—the correct approach is proper routing with protection and securement so they stay in good condition.