Dorman 904-857 Vacuum Pump

Overview of Dorman 904-857 Electric Vacuum Pump

The Dorman 904-857 electric vacuum pump is designed specifically for Jeep Wrangler and Wrangler JK models. This vacuum pump supports emission control systems by providing reliable vacuum pressure through an electric motor drive, ensuring consistent performance in your vehicle's vacuum system.

• Electric motor drive type for efficient vacuum generation
• Aluminum housing for durability and heat dissipation
• Includes mounting hardware and extended wire harness for straightforward installation
• Two vacuum ports with barbed connectors for secure hose attachment
• Relief valve integrated to protect the system from overpressure
• Blade-type terminals with female rectangular connectors for reliable electrical connections

Detailed Product Description and Specifications

The Dorman 904-857 vacuum pump features an electric motor drive system that eliminates the need for a pulley, as none is included. The pump has two vacuum ports, each with a 0.38-inch inlet port outside diameter and a 0.225-inch outlet port outside diameter, designed to fit the vacuum hoses on Jeep Wrangler and Wrangler JK models. The aluminum housing provides a lightweight yet sturdy construction, helping to maintain optimal operating temperatures. The pump assembly comes complete with a hose connector, an extended wire harness, and mounting brackets, facilitating a secure and proper fit during installation. The blade terminal type with two terminals and a female rectangular connector ensures compatibility with the vehicle's electrical system. Additionally, the integrated relief valve safeguards the vacuum system by preventing excessive pressure buildup.

Applications and Common Issues Addressed

• Restores vacuum pressure for emission control systems in Jeep Wrangler and Wrangler JK
• Resolves issues related to vacuum leaks or insufficient vacuum pressure
• Replaces faulty or worn electric vacuum pumps causing engine performance problems
• Supports proper operation of brake boosters and other vacuum-dependent components
• Helps maintain compliance with emission regulations by ensuring vacuum system integrity

Installation Notes and Tips

Installation of the Dorman 904-857 vacuum pump is straightforward with the included mounting hardware and extended wire harness. Ensure all vacuum hoses are securely connected to the barbed vacuum ports to prevent leaks. Verify the electrical connections match the blade-type terminals and female rectangular connector for proper fit. It is recommended to inspect related vacuum lines and seals during installation to avoid future issues. No gasket or diaphragm is included, so reuse existing seals if in good condition or replace as necessary.

Quality Assurance and Warranty

Dorman manufactures the 904-857 vacuum pump with quality materials such as aluminum housing and reliable electric motor components. The product is engineered to meet or exceed OEM specifications for Jeep Wrangler and Wrangler JK models. While specific warranty details are not provided here, Dorman typically offers limited warranties on their emission control parts to ensure customer confidence and product reliability.