The high main fuel manifold is constructed from which component?

• A. Braided stainless steel hose
• B. Flexible tubing
• C. Steel braided tough line hoses
• D. Plastic tubing

Answer: (C)

Fuel lines feeding the main manifold must carry fuel under high pressure while enduring vibration, heat, and movement around the engine. Steel braided tough line hoses provide a robust, fuel‑compatible core with a reinforcing steel braid that gives high pressure rating and abrasion resistance, plus an outer jacket to prevent chafing. This combination handles the demanding environment of the high main fuel path, keeping fuel delivery reliable and durable. Flexible tubing or plastic tubing don’t offer the same strength, temperature/fuel resistance, or pressure containment, and a generic braided hose may not meet the specific toughness and durability required for the main distribution line.