Mercury 9E5Z-6758-B Tube Assembly

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Because the area beneath the hood of a vehicle overheats, leading to degradation of materials, rubber and plastic hoses must be regularly inspected in the engine, accessory, and emission systems. These hoses should be looked for cracks, loose clamps, hardening and leaks. Check if clamped hoses do not lose their tension that may lead to leakage. Make sure replacement hoses for vacuum are made of the same material. To fully assess hoses they might need to be removed from the vehicle; hence, mark hoses and fittings for proper reinstallation later. Pay attention to the t-fittings made of plastics that can crack easily and when they connect there is distortion on fitting and hose. Detecting vacuum leaks can be done by using a small piece of vacuum hose as stethoscope by feeling sounds produced by a hissing sound while probing with it around fittings and hoses. Be ready to catch spilled fuel while working with fuel hoses since they are usually pressurized. In particular check for deterioration, chafing and cracks especially at bends and near fittings.