GM Injection Pump Return Hose, Duramax LLY | 2004.5 - 2005

The genuine GM 97321372 injection pump return hose carries excess fuel from the CP3 injection pump back into the fuel return system on 2004.5-2005 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L LLY Duramax. Engine heat and age harden these rubber hoses until they crack or seep at the ends. That leaves diesel on top of the engine, a fuel smell and, if air gets into the system, hard starting. The factory hose has the original fittings and routing, so it installs without modification.

Key Features

• Genuine GM part number 97321372
• CP3 injection pump fuel return hose
• Factory fittings, length and routing
• Fuel-rated hose for the LLY low-pressure system
• Backed by GM's factory parts warranty

Benefits

Replacing an aged return hose stops fuel seepage and the risk of air getting into the fuel system. If one LLY fuel hose has failed, the others are usually close behind. Consider replacing the Fuel Filter Outlet Hose, the Fuel Filter to FICM Hose and the Fuel Rail to Fuel Return Hose at the same time.

Fitment

Fits 2004.5-2005 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD with the 6.6L LLY Duramax diesel.

What's Included

• (1) GM injection pump return hose, 97321372