Mahle GS33530 Fuel Injector O-Ring Kit - Upper

Mahle Fuel Injector O-Ring Kit GS33530

Restore a secure seal at the fuel injector-to-fuel rail connection with the Mahle Fuel Injector O-Ring Kit GS33530. Built to OEM standard and made with fluoroelastomer O-ring material, this kit is designed for dependable sealing performance across a wide range of GM, Cadillac, Buick, Pontiac, and Hummer applications.

Mahle fuel injector sealing products are used by OEMs and technicians worldwide, and this GS33530 kit follows that same OE-style approach for service work on vehicles such as the Chevrolet Silverado 1500, GMC Sierra 2500 HD, and Cadillac Escalade.

Key Features

• OEM Standard item grade for service replacement use
• Fluoroelastomer O-ring material for fuel system sealing
• Designed for upper injector-to-fuel rail applications
• Brand line focused on fuel injector sealing service kits
• Cross-references FEL-PRO ES 71192 and General Motors 12482706, 12587147 for the same application

Product Details

The Mahle Fuel Injector O-Ring Kit GS33530 is a fuel delivery service kit built around sealing performance. Fluoroelastomer is commonly selected for fuel system service because it is suited to the demands of injector sealing in modern gasoline applications. This kit supports maintenance on a broad range of vehicles, including Chevrolet Express 2500, GMC Savana 3500, Chevrolet Silverado 2500 HD, and GMC Sierra 3500 HD models, along with many earlier GM passenger and truck platforms.

Use GS33530 when servicing injector seals on upper fuel rail connections where a precise, fuel-tight fit is required. The Mahle brand line is centered on sealing products for repair work that follows OE-style specifications, making this part a practical choice for injector service on GM trucks, SUVs, and performance cars.

Common Problems This Part Can Address

• Fuel seepage at the injector-to-rail sealing point
• Hard starting caused by loss of fuel rail pressure
• Fuel odor from deteriorated injector seals
• Visible wetness around upper injector connections
• Service replacement during injector or fuel rail maintenance

Installation Notes and Tips

Confirm vehicle fitment by year, make, model, and upper position before installation. Inspect the injector and fuel rail sealing surfaces for wear, debris, or damage before installing the new O-rings. Clean mating surfaces thoroughly and lubricate seals with clean engine oil or an approved fuel-system lubricant during assembly to help prevent pinching or tearing.

Fits 2017-2020 Chevrolet Express 2500, upper; Fits 2017-2020 Chevrolet Express 3500, upper; Fits 2017-2020 GMC Savana 2500, upper; Fits 2017-2020 GMC Savana 3500, upper; Fits 2017-2019 Chevrolet Silverado 2500 HD, upper; Fits 2017-2019 GMC Sierra 3500 HD, upper.

Quality Assurance

Mahle supplies sealing products trusted in OEM and technician service environments, and GS33530 is built to OEM standard for consistent fuel injector sealing performance.