Fuel Injector Return Line Cummins 3909696 | 3905691, 3905117, 3913930

Reliable Fuel Return Solution for Cummins 5.9L Engines

The Cummins 3909696 Fuel Injector Return Line (also referred to as a fuel return manifold) is a critical component designed to route excess fuel from the injectors back to the fuel system. Over time and during routine injector maintenance, the factory return line is highly susceptible to cracking and leaking. Replacing it with this high-quality line ensures a secure, leak-free connection and maintains proper fuel system pressure.

Product Features & Benefits:

• Direct-Fit Replacement: Engineered to match factory specifications for a seamless installation on Cummins B-series engines.
• Durable Construction: Fabricated from premium materials to withstand high vibrations, temperature fluctuations, and constant fuel exposure.
• Prevents Fuel Leaks: Eliminates the risk of fuel loss and pressure drops caused by cracked or worn return lines.

Engine & Vehicle Compatibility:

• Engine Models: Cummins 6BT 5.9L (12-Valve), 4BT 3.9L
• Applications: 1989–1993 Dodge Ram pickups with the 5.9L 12V Cummins engine, as well as various industrial and agricultural applications.