Collection: 2004.5-2005 Duramax LLY Fuel Delivery

6.6L Duramax LLY Fuel Delivery

Fuel delivery and injection upgrades for the 2004.5–2005 GM 6.6L Duramax LLY. Adequate fuel supply is the foundation for predictable, reliable added power. Every part is matched to your truck and the rest of your build.

Fuel Delivery

Fuel delivery and injection upgrades. Addressing fuel supply first keeps added power predictable and protects the injection system.

Compatibility

Organized by confirmed fitment for the 2004.5–2005 GM 6.6L Duramax LLY.

FAQ

Do I need a lift pump?
A lift pump maintains consistent supply pressure to the injection system, which matters more as fueling and power increase.

What fuel upgrade do I need?
Stock-to-mild builds run the factory system; higher power calls for added fuel supply and supporting hardware.