Rubber Fuel Hose Kit, LLY Duramax | 2004.5-2005

The Merchant Automotive Rubber Fuel Hose Kit replaces the rubber low-pressure fuel hoses on 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500HD pickups with the LLY 6.6L Duramax diesel. The five molded hoses are shaped to the factory routing and built for diesel fuel, and the kit includes the short straight fuel return hose, so you can replace every hardened or cracked hose in one job. This kit does not fit Kodiak or TopKick trucks.

Features

• Complete set of six rubber fuel hoses for the LLY Duramax
• Five molded hoses built for diesel fuel
• Molded to the factory shape for a direct fit
• Covers the fuel filter, FICM, injection pump, fuel rail and fuel return hoses
• Clamps are not included. Reuse your factory clamps or install new ones.

What's Included

• (1) Fuel Rail to Fuel Return Hose, replaces GM 97321375
• (1) Injection Pump Return Hose, off the CP3 injection pump
• (1) Injection Pump Inlet Hose, replaces GM 12625277
• (1) Fuel Filter to FICM Hose, between the fuel filter head and the FICM
• (1) Fuel Filter Outlet Hose
• (1) Fuel Return Hose, 2.5" straight, between the fuel return pipe and the fuel injection manifold

Why Replace Them

Factory rubber fuel hoses harden, swell and crack with age and engine heat. A failing hose can leak fuel, leave a diesel smell under the hood, or let air into the fuel system. Air in the fuel can cause hard starts, rough running, loss of power or the need to re-prime after a fuel filter change. When one hose fails, the others are usually close behind, so replacing the full set at once saves you from chasing leaks one hose at a time.

Installation Tips

• Relieve fuel pressure and disconnect the batteries before removing any fuel hoses.
• Replace one hose at a time to keep the routing correct.
• Inspect the clamps and replace any that are rusted or weak.
• Prime the fuel system after installation and check every connection for leaks.

Frequently Asked Questions

Are clamps included?
No. Reuse your factory clamps if they are in good condition, or install new ones.

Does this fit Kodiak or TopKick trucks?
No. This kit fits 2004.5-2005 Silverado and Sierra 2500HD and 3500HD pickups with the LLY only.

Will it fit a 2006 LLY?
No. Several hoses changed for 2006. For 2006-2010 trucks, use the 2006-2010 Rubber Fuel Hose Kit.

Can I buy the hoses individually?
Yes. The five molded hoses are also sold separately. Use the links in the What's Included list.

Do I need to prime the fuel system after installing?
Yes. Prime the system after replacing the hoses to remove any air before starting the engine.

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