Sunsong 3404673 Power Steering Reservoir Hose - Reservoir To Pump

BMW Power Steering Reservoir Hose

Sunsong 3404673 is a power steering reservoir hose for reservoir-to-pump return routing on select BMW models with Active Steering. It is built for low-pressure, high-temperature return service and is engineered to match the original hose layout for a direct replacement on the listed applications.

Key Features

• Return hose for power steering reservoir-to-pump routing
• Rated for up to 250 psi working pressure
• Suitable for low-pressure, high-temperature operation
• High-grade steel tubing with zinc electroplating for corrosion and rust resistance
• Precision-engineered fit for the listed BMW applications
• Includes required brackets, grommets, heat shields, bushings, and protective sleeves as needed to restore wearable components to original condition

Detailed Description

This Sunsong power steering reservoir hose is built to replace the return-side hose assembly on BMW 135i, 135is, 335i, 335is, 1 Series M, and 335i xDrive models equipped with Active Steering. Part number 3404673 is designed around the original routing and connection points for reservoir-to-pump service, helping maintain proper fluid transfer in the steering system. The steel tubing and zinc coating add resistance against humidity, road salt, water, and grime, which is important for vehicles exposed to harsh underbody conditions. This part cross-references Gates 353083 for the same application.

What It Helps Address

• Leaking or seepage at the power steering return hose
• Corrosion on the original reservoir-to-pump line
• Cracked, worn, or heat-damaged hose sections
• Restricted fluid return caused by aged hose materials
• Noise or steering performance issues related to fluid loss

Installation Notes and Tips

Verify Active Steering configuration before ordering. Confirm the hose routing matches the reservoir-to-pump position listed for your vehicle, and inspect adjacent brackets, grommets, heat shields, bushings, and sleeves during replacement. Properly route the hose away from heat sources and moving components, and refill and bleed the power steering system according to BMW service procedures after installation. Fits 2008-2013 BMW 135i, Reservoir To Pump; Fits 2013 BMW 135is, N/A; Fits 2007-2013 BMW 335i, Reservoir To Pump; Fits 2011-2013 BMW 335is, Reservoir To Pump; Fits 2011 BMW 1 Series M, Reservoir To Pump; Fits 2009-2010 BMW 335i xDrive, Reservoir To Pump.

Quality Assurance

Sunsong manufactures this hose to meet original equipment performance standards for return-hose service, with materials and corrosion protection selected for demanding underhood and underbody conditions.