Fix a leaking IPR valve without replacing the whole valve.

The Ford 3C3Z-9H529-A IPR Valve Seal Kit is a genuine Ford service kit for resealing the injection pressure regulator (IPR) valve on the 6.0L Powerstroke. If your IPR valve is leaking but still working, resealing it can restore proper high-pressure oil system pressure at a fraction of the cost of a new valve.

Why IPR seals matter.

The 6.0L Powerstroke uses high-pressure engine oil to fire its injectors, and the IPR valve controls that pressure. The IPR sits on the high-pressure oil pump, where its O-rings are a common failure point. When those seals wear or harden, high-pressure oil leaks past them, and the system can't build or hold the pressure the injectors need.

Genuine Ford quality.

Using a genuine Ford seal kit ensures the correct seal sizes and materials for a factory-quality, leak-free repair.

Key Features

• Genuine Ford OEM IPR valve seal kit
• Reseals a leaking IPR valve to restore proper pressure
• Cost-effective alternative to replacing the entire IPR valve
• Factory-correct seal sizes and materials
• Ideal for IPR service, high-pressure oil system repairs and preventive maintenance
• Cross-references to Alliant AP0035 and Dorman 904-415
• Fits 2003–2007 Ford 6.0L Powerstroke

What Problem Does This Solve?

• Hard starts and no-starts from oil leaks. Leaking IPR seals let high-pressure oil escape, which can keep the system from building enough pressure to fire the injectors. That often shows up as long cranking, especially when the engine is hot.
• Low power and rough running. When the high-pressure oil system can't hold steady pressure, the injectors can't operate correctly, causing low power, stumbling or rough idle.
• Paying for parts you don't need. If the IPR valve itself is still working, there's no need to buy a whole new valve. A seal kit fixes the leak for much less.

Installation Tip

A special IPR valve socket makes removal and installation much easier without damaging the valve. While the IPR is out, many technicians also inspect its screen, since it can become plugged with debris and restrict high-pressure oil flow.