Mercury 7T4Z-6A664-CA Vent Hose

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To detect vacuum leaks, you can use a small piece of vacuum hose as a stethoscope. Listen for hissing sounds while probing around hoses and fittings. Be cautious when working with fuel hoses, as they are typically under pressure. Check them for deterioration, chafing, and cracks, especially in bending areas and near fittings. Use hose specifically designed for your fuel injection system when replacing, and be aware of quick-connect fittings that may require special tools for disconnection.

When inspecting metal fuel lines underneath the vehicle, ensure they are not bent, crimped, or cracked. Replace any sections with seamless steel tubing if necessary, as copper and aluminum tubing may lack the necessary strength to withstand engine-induced vibrations. Additionally, inspect metal brake lines at their entry points into the master cylinder and brake proportioning unit for cracks and loose fittings, addressing any brake fluid leakage promptly with a thorough brake system inspection.

Clamps are often used to secure hoses, and you should ensure that they maintain tension to prevent leakage.

Metal fuel lines should be inspected for bends, crimps, and cracks.