Dorman 994-478 Vapor Canister

Overview of the Dorman 994-478 Vapor Canister

The Dorman 994-478 vapor canister is designed to support the evaporative emission control system in select Chevrolet, Pontiac, and Saturn vehicles. This component helps reduce harmful fuel vapors from escaping into the atmosphere, maintaining compliance with emission standards.

• Compatible with Chevrolet Cobalt, Pontiac G5, Saturn Ion, and Saturn Pursuit models
• Constructed with durable plastic housing and carbon filter element
• Features three ports with oval-shaped female connectors
• Includes two male bullet-type terminals for secure connections
• Measures 331 mm in length with a 0.63-inch inside diameter

Detailed Product Features and Specifications

The Dorman 994-478 vapor canister is engineered with a plastic housing that provides resistance to corrosion and environmental wear. It contains a carbon filter element that effectively traps fuel vapors, preventing their release into the atmosphere. The canister includes three ports with an outside diameter of 16 mm and 9.6 mm, designed with oval-shaped female connectors to ensure a proper fit with the vehicle’s evaporative system hoses. Two male bullet-type terminals facilitate electrical connections, supporting system functionality. This vapor canister does not include mounting hardware or additional filter elements, so ensure compatibility with your vehicle’s existing setup.

Compatible Vehicles and Applications

This vapor canister is specifically compatible with the following vehicles:

• Chevrolet Cobalt
• Pontiac G5
• Saturn Ion
• Saturn Pursuit

Use the Dorman 994-478 vapor canister to address issues related to evaporative emission control in these models.

Common Issues Addressed by the Vapor Canister

• Fuel vapor leaks causing increased emissions
• Check engine light triggered by evaporative system faults
• Failed emissions tests due to vapor canister malfunction
• Fuel odor around the vehicle due to vapor containment failure
• Reduced fuel efficiency linked to evaporative system problems

Installation Notes and Tips

When installing the Dorman 994-478 vapor canister, verify that the oval-shaped female connectors align correctly with the vehicle’s evaporative system hoses. Ensure the two male bullet terminals are securely connected to maintain proper electrical function. Since mounting hardware is not included, use existing brackets or hardware from the original part. Inspect all hoses and connectors for wear or damage during installation to prevent future leaks.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 994-478 vapor canister undergoes quality checks to ensure durability and reliable performance in emission control systems. Please refer to Dorman’s official warranty policy for specific coverage details.