STC New One-Piece High Pressure Oil Connector [4c3z-9b246-f]

Since the redesign of the high pressure oil pump for 2005 and newer Power Stroke diesel engines the "snap-to-connect" or STC fitting used to connect the high pressure oil pump to the oil supply branch tube has been problematic. The two piece fittings have a tendency to flex causing wear on the seal and the locking ring resulting in leaks and occasionally the complete separation of the fitting. When a leak occurs at this fitting, the engine may be difficult to start or may not start at all. Depending on the severity of the leak the engine may stall, sometimes abruptly and without warning.

A repair kit was developed containing a replacement fitting, connector and a bracket that supported the assembly preventing any movement of the branch tube and connector. To the best of our knowledge this kit is effective in preventing STC fitting failures and continues to be an approved repair. Some owners are installing this bracket as a preventative measure for piece of mind. We also recommend installing it if the pump is exposed during repairs however it is not covered under warranty unless the fitting fails. A new fitting shown has been designed is a one piece connector most likely intended to address this issue for production engines. The new connector is reported to be in production 4.5L and 6.0L Power Strokes for 2008 model year LCF trucks and Econoline along with the International VT-275 and the VT-365. The 6.0L Power Stroke diesel engine remains as an engine option for the 2008 Econoline.

The fitting is installed in production engines starting from: