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Fuel Sending Unit
For 2006-2007 Chevy/GMC Trucks With 6.6L Duramax LBZ Diesel Engine
Fuel Tank Sending Units for 6.6L Duramax LLY & LBZ Trucks
Fuel tank sending units are a foundational component of the fuel system on 2006 and 2007 Chevy/GMC HD trucks equipped with the 6.6L Duramax LLY or LBZ diesel engines. Installed inside the fuel tank, the sending unit assembly manages fuel pickup, fuel return routing, and fuel level measurement for the dash gauge. Proper operation of this component is critical for consistent fuel supply and accurate fuel level readings. The LLY and LBZ Duramax platforms do not use a factory in-tank lift pump. Instead, fuel is drawn from the tank by the engine-mounted high-pressure fuel pump. Because of this design, the sending unit’s pickup and internal condition play an important role in overall fuel system reliability, particularly as these trucks age.
Tech Tips to Know Before You Buy
- OE-Style Replacement Sending Units: Designed to restore factory fuel system function, these units replace worn or failing components inside the tank, including the fuel level sender. They are ideal for correcting inaccurate fuel gauge readings or addressing age-related wear while keeping the fuel system stock.
- Upgraded / Performance-Style Sending Units: Some sending units are designed to support increased fuel flow demands when the fuel system has been modified. These options typically offer improved pickup design or revised supply and return connections compared to the factory configuration.
Why Replace the Fuel Tank Sending Unit?
- Fuel Gauge Accuracy Issues: Wear to the level sender, float mechanism, or internal electrical components can cause the fuel gauge to read incorrectly or behave erratically, an issue commonly seen on higher-mileage LLY and LBZ trucks.
- Age-Related Component Wear: Over time, internal components can degrade due to constant movement, fuel exposure, and electrical resistance wear, making replacement necessary to maintain reliable operation.
- Fuel System Performance Upgrades: When modifying or upgrading the fuel system, replacing the sending unit can allow you to easily hoook up aftermarket lift pumps and help ensure proper fuel pickup and return flow without altering the fuel tank itself.
Shop Fuel Sending Units for Your GM 6.6L LLY/LBZ Duramax
Find the correct fuel tank sending unit for maxmimum performance, or to restore fuel system reliability and accurate fuel level readings on your diesel truck. Fuel tank sending units are available for 2006 and 2007 Chevrolet Silverado 2500HD and 3500HD and GMC Sierra 2500HD and 3500HD models equipped with the 6.6L Duramax LLY or LBZ diesel engines.