6.0L Powerstroke Blue Spring Fuel Pressure Regulator Kit

The Motorcraft 3C3Z-9T517-AG fuel pressure regulator kit, commonly referred to as the "blue spring kit," is an essential performance update for 2003-2007 Ford 6.0L Powerstroke diesel engines. Low fuel pressure is a frequent contributor to injector failure in these engines, and this OEM-standard upgrade increases fuel pressure by roughly 10% to prevent potential damage and extend the lifespan of your fuel injectors. This Genuine Ford kit consists of two primary components: a slightly stronger, updated pressure regulator spring and a replacement gasket for the pressure regulator cover. It replaces several previous Ford part numbers, including 3C3Z-9T517-AE, 3C3Z-9T517-AA, and 3C3Z-9T517-AD, ensuring reliable operation and longevity to meet Ford’s rigorous quality control standards. Installation is considered a straightforward task for those with basic mechanical abilities. To access the secondary fuel filter housing located on top of the engine, you may need to remove intake ductwork and temporarily reposition coolant hoses. During the procedure, it is critical to maintain pressure on the regulator housing cover while removing the four Torx screws to prevent the internal spring from pushing the cover off unexpectedly. After replacing the spring and gasket, the fuel system should be primed by cycling the ignition key several times before starting the engine. This part is compatible with 2003-2005 Ford Excursion and 2003-2007 Ford F-250, F-350, F-450, and F-550 Super Duty models equipped with the 6.0L Powerstroke diesel engine. Please note that this is a stock rebuild component and does not provide high-flow performance upgrades or improved gas mileage.