Warning: Air conditioning hose replacement should be done by a dealer or a person with the proper equipment to depressurize the system. Never remove air conditioner components or system hoses until the system is depressurized.
Vacuum hoses
1. High temperatures under the hood can cause damage to rubber and plastic hoses used in the engine, accessory components and in the emission system.
2. Periodically inspect hoses for cracks, loose clamps, hardening, and leaks.
3. Some vacuum hoses are attached to the nozzles with clamps, the reliability of which also needs to be checked periodically to avoid leaks. Where clamps are not used, make sure the end of the hose is not stretched and/or hardened, which can also lead to leaks.
4. As a rule, vacuum hoses, especially in the emission system, are code-colored or marked with colored stripes fused into the hose. Different systems use hoses with different wall thicknesses, strengths and heat resistance. When replacing hoses, use only adequate replacements.
5. Often, in order to effectively check the hose, it must be removed from the vehicle. If more than one hose needs to be removed, make sure the hoses and their connections are labeled so as not to frighten them when reinstalling.
6. When checking vacuum hoses, also inspect all plastic T-joints. Check them for cracks. Inspect the hose ends for tight fit to the joints, stretching the ends can lead to leaks.
7. A small piece of vacuum hose can be used to detect vacuum leaks (inner diameter 6 mm). Attach one end of the hose to your ear and bring the other end to the vacuum hose connections and joints. A hissing sound will indicate a vacuum leak.
Warning: Check vacuum hoses for leaks carefully, do not touch body parts or test hose to rotating engine components such as drive belts, cooling fan, etc.
Fuel hoses
8. Warning: There are a number of precautions that must be taken when inspecting or servicing fuel system components. Work in a well ventilated area and keep the work area free of open flames (cigarettes, matches, etc.) or electric lamps (they may burst, causing the fumes to ignite). Wipe up spilled fuel immediately and do not store fuel-soaked rags where they could ignite.
9. Fuel lines are normally under slight pressure, so if fuel lines need to be disconnected, be prepared for fuel to come out of the ends.
10. Check all rubber fuel lines for damage or fraying. Especially carefully inspect the bends of the hoses and the places where they are attached to the fuel pump, fuel filter and carburetor.
11. High quality hoses, usually labeled Fluroelastomer, should be used to replace fuel line components. Never use loose vacuum hoses, plastic pipes or water hoses for this.
12. Spring clamps are commonly used on fuel lines. These clamps loosen over time. Therefore, when removing the hose, it is recommended to replace these clamps with screw clamps.
Metal tubes
13. Metal pipes are often used between the fuel pump and the carburetor. Carefully inspect the line to make sure that the tubing is not bent or cracked in the area of the bends.
14. Use only seamless steel tubing to replace the metal fuel line, as copper and aluminum tubing is not rigid enough to withstand engine vibration during operation.
15. Check up metal brake pipes in places of their connections with the main cylinder and brakes on cracks and durability of connections. At detection of the slightest sign of leak of a brake liquid immediately completely inspect the brake system.