The Merchant Automotive Injection Pump Inlet Hose replaces GM 12625277 on 2004.5 - 2010 LLY, LBZ and LMM 6.6 Liter Duramax Silverado and Sierra 2500HD/3500HD trucks. This hose supplies fuel to the inlet of the CP3 high-pressure injection pump. Factory rubber hoses harden and crack with age and engine heat.

A failing inlet hose can leak fuel, and it can also let air into the fuel supply, causing hard starts, rough running or loss of power. Our molded replacement is built for diesel fuel and made to match the factory hose's shape for a precise fit.

Key Features

• Replaces GM 12625277
• Molded to the factory shape for a precise fit
• Built for diesel fuel and resists degradation
• Merchant Automotive branded

Benefits

• Stops fuel leaks from a cracked or hardened factory inlet hose
• Keeps air out of the CP3 fuel supply
• Installs like the original, with no cutting or fitting

Frequently Asked Questions

Where is this hose located?

It's the fuel supply hose connected to the inlet of the CP3 injection pump, in the engine valley.

What are the signs of a bad inlet hose?

Fuel seeping around the injection pump, a diesel smell, or air in the fuel system that causes hard starting, rough running or loss of power.

Should I replace this when I replace my CP3?

Yes. The hose is disturbed during CP3 removal, and it's inexpensive to replace while you're there. It's included in our CP3 Install Gasket Kits.

Are clamps included?

No. Reuse your factory clamps if they're in good condition, or replace them if they're rusted or weak.

Fitment

• 2004.5 - 2010 Chevrolet Silverado 2500HD / 3500HD 6.6 Liter Duramax (LLY, LBZ, LMM)
• 2004.5 - 2010 GMC Sierra 2500HD / 3500HD 6.6 Liter Duramax (LLY, LBZ, LMM)

Replacing your CP3? See our CP3 Fuel Injection Pump Install Gasket Kit for 2004.5 - 2005 LLY, 2006 - 2007 LBZ or 2007.5 - 2010 LMM. Replacing other fuel hoses?

See our Injection Pump Return Hose for 2004.5 - 2005 or 2006 - 2010, and the Fuel Rail to Fuel Return Hose.

What's Included

• (1) Merchant Automotive injection pump inlet hose

For warranty information or to submit a claim, see our Warranty Form.

Details:

• Engine Manufacturer: Duramax
• Liter: 6.6 Liter
• Engine Designation: LLY, LBZ, LMM
• Engine Years: 2004-2010

Applications:

• 2004-2010 Silverado/Sierra 2500HD/3500HD LLY/LBZ/LMM