Dorman 994-077 Vapor Canister Vent Valve

Dorman 994-077 Vapor Canister Vent Valve

The Dorman 994-077 vapor canister vent valve is a direct-fit evaporative emissions component for select GM SUVs and trucks. It is built with metal and plastic construction to help restore proper venting in the EVAP system and address check engine light concerns tied to vent valve failure.

Key Features

• Specific-fit vapor canister vent valve for select applications
• Metal and plastic construction for durability
• Black finish
• Female inlet and outlet connections with 0.625 in. outside diameter
• Single inlet and single outlet design
• Replacement for Dorman 994-077 and related cross-reference numbers

Detailed Description

This evaporative emissions vent valve is engineered for vehicles that rely on controlled vapor routing to maintain proper fuel system operation. On applications such as the Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon, a worn or malfunctioning vent valve can trigger EVAP-related fault codes and illuminate the engine light. Dorman 994-077 is built to replace the original valve with a specific-fit design that matches the intended connection points and mounting layout.

This part cross-references Standard Ignition CVS107 for the same application. The Dorman 994-077 part number is also useful when searching for a replacement vapor canister vent valve for 2000-2004 Chevrolet Tahoe, 2000-2004 GMC Yukon, and 2002-2005 Cadillac Escalade.

What It Helps Fix

• Check engine light caused by EVAP vent valve faults
• Improper vapor canister venting
• Evaporative emissions system leak or flow codes
• Fuel vapor control issues related to a stuck or failed vent valve
• Driveability concerns tied to emissions system malfunction

Installation Notes and Tips

Verify connector style, hose diameter, and mounting location before installation. This valve uses female ends with 0.625 in. outside diameter connections and is designed for a specific fit, so matching the original part configuration is important. Inspect nearby EVAP hoses and fittings for cracks or wear during replacement to help prevent repeat faults.

Quality Assurance

Dorman builds this replacement valve from quality materials to support durable operation in the vehicle’s evaporative emissions system. It is intended as a direct replacement for select Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon applications covered by the listed fitment.