Ford Motorcraft HPOP (High Pressure Oil Pump) Seal Kit for Ford (2003-04) 6.0L Power Stroke Diesel

The Ford Motorcraft 3C3Z-9G804-AA HPOP Seal Kit is a genuine OE replacement seal package for 2003–2004 Ford 6.0L Power Stroke diesel engines equipped with the early aluminum-body high-pressure oil pump. The high-pressure oil system is essential to HEUI injector operation, so reliable sealing at the pump and discharge-tube connections is critical for maintaining injector control pressure.

This kit includes the three molded seals used at key early-HPOP connections: one pump inlet O-ring, one discharge-tube O-ring, and one D-ring seal for the discharge tube. These seals are intended to replace components that have become hard, cut, flattened, torn, or otherwise unable to maintain a dependable high-pressure oil seal.

High-pressure oil leaks can contribute to difficult starting, extended crank times, no-start conditions, or injector control pressure concerns. Replacing the HPOP seals during pump, injector, oil-rail, or related high-pressure oil-system service is a practical way to address known leaks and reduce the risk of reusing aged seals in a labor-intensive repair area.

Part number 3C3Z-9G804-AA is designed specifically for the early 2003–2004 6.0L Power Stroke configuration. Verify engine build date, pump material and style, and the high-pressure oil-system configuration before ordering, as later 6.0L engines use a different HPOP design and related sealing arrangement.