1. The assembly allows internal fuel lines to flex as the shuttle climbs. 2. Yunick had installed a wider fuel line that held six additional gallons. 3. Two fuel line doors are located in the underside of each shuttle. 4. A fuel line carried nitric acid around the kerosene, into the engine. 5. The satellite's hydrazine-filled fuel lines might have leaked in excessively cold temperatures. 6. Later, sugar was found in the fuel lines , prompting suspicion of sabotage. 7. His first thought was that a fuel line had exploded, he said. 8. However, he is initially unaware of a leak in the fuel line . 9. The openings are for fuel lines connecting the shuttle and the tank. 10. Gasoline can leak from a small hole in the engine's fuel line .