Dorman 994-077 Vapor Canister Vent Valve

Overview of Dorman Vapor Canister Vent Valve 994-077

The Dorman 994-077 vapor canister vent valve is designed specifically for select Cadillac, Chevrolet, and GMC models, including the Escalade, Tahoe, and Yukon. This component plays a critical role in the vehicle's evaporative emission control system by regulating vapor flow and maintaining proper fuel system pressure.

• Constructed with durable metal and plastic materials for reliable performance
• Measures 48.5 mm in length with a compact black design
• Features female connectors on both ends with 0.625 inch outside diameter
• Includes one inlet and one outlet for precise vapor flow control
• Designed for specific fitment on Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon

Detailed Product Description

The Dorman 994-077 vapor canister vent valve is engineered to meet the exact specifications required by the evaporative system of your vehicle. Its combination of metal and plastic materials ensures durability while maintaining a lightweight profile. The valve measures 48.5 mm in length and is finished in black, allowing it to integrate seamlessly within the engine compartment. Both ends of the valve feature female connectors with an outside diameter of 0.625 inches, ensuring a secure and leak-free connection to the vapor canister and associated hoses. This part is a direct replacement designed specifically for Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon models, providing a precise fit without the need for modifications.

Common Applications and Issues Addressed

• Prevents fuel vapor leaks that can trigger the check engine light
• Maintains proper pressure in the evaporative emission system
• Helps reduce harmful hydrocarbon emissions from the fuel system
• Resolves issues related to failed vapor canister vent valves causing poor fuel economy
• Eliminates rough idling or stalling caused by faulty vent valves

Installation Notes and Tips

• Ensure the vehicle is cool and parked on a level surface before installation
• Verify the part number 994-077 matches your vehicle’s requirements
• Disconnect the battery to prevent electrical hazards during replacement
• Carefully remove the old vent valve and inspect surrounding hoses for wear
• Install the new valve with female connectors aligned properly to avoid leaks
• Test the evaporative system for leaks after installation to confirm proper function

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The 994-077 vapor canister vent valve undergoes rigorous quality control testing to maintain consistent functionality. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to the product documentation for exact warranty terms.