AA Ignition Fuel Pressure Regulator Kit for Ford 6.0L Diesel - Blue 6.0 Spring, Direct-Fit Replacement (2003–2007)

AA Ignition's Fuel Pressure Regulator Kit with the blue 6.0 spring is a direct-fit replacement that restores stable fuel pressure to 2003–2007 Ford 6.0L diesel applications.

This kit replaces part number 3C3Z-9T517-AG and addresses symptoms caused by low or inconsistent fuel pressure—such as hard starting, stalling, reduced power and rough idling—by providing a plug-and-play regulator with upgraded spring and seals. It’s engineered to match factory dimensions and mounting points for Ford Excursion (2003–2005) and Ford F-250/F-350 Super Duty (2003–2007). Backed by AA Ignition’s lifetime warranty, the kit aims to deliver reliable performance without needing modifications.

How does this regulator kit improve engine starting and idle?

Replacing a worn or leaking regulator re-establishes correct fuel pressure at the injectors, which helps the engine receive the correct fuel volume during startup and idle. With stable pressure, combustion timing and fuel delivery are more consistent, reducing rough running and hard starts.

• Direct-fit replacement of 3C3Z-9T517-AG for easy swap
• Upgraded blue 6.0 spring for improved pressure stability
• New seals to prevent leaks that cause pressure loss
• Works with existing fuel lines and mounting points—no cutting or adapters

Will this part fit my Ford Excursion or Super Duty truck?

This kit is designed specifically for Ford Excursion 2003–2005 and F-250/F-350 Super Duty 2003–2007 6.0L diesel models. Always compare the part number on your current regulator—3C3Z-9T517-AG or compatible cross-reference—to confirm compatibility before purchase.

• Intended for 2003–2005 Excursion and 2003–2007 F-250/F-350 6.0L diesels
• Cross-references OEM part number 3C3Z-9T517-AG for verification
• Check the full compatibility chart or vehicle VIN for exact fit confirmation

What comes in the kit and what should I replace at the same time?

The kit includes the fuel pressure regulator assembly with the blue 6.0 spring and replacement seals. For the most reliable repair, replace the fuel filter concurrently to prevent contaminants or a clogged filter from masking pressure issues.

• Regulator assembly with upgraded spring and new seals included
• Plug-and-play design uses existing fuel lines and hardware
• Recommended to change fuel filter during installation for best results

Does this kit meet OEM standards and what warranty is offered?

While not a genuine OEM component, the kit is manufactured to match factory fit and function with improved internal components for durability. AA Ignition supports this product with a lifetime warranty—contact them for replacement if the kit fails under normal use.

• Engineered to OEM dimensions and mounting points
• Improved spring and seals for longer-lasting pressure control
• Lifetime warranty backed by AA Ignition for peace of mind

Who is this for: This fuel pressure regulator kit is aimed at owners and technicians servicing 6.0L Ford diesel trucks—particularly those experiencing hard starting, stalling, low power or unstable idle—who need a reliable, direct-fit replacement that matches OEM fitment and simplifies installation. It’s a practical upgrade for DIY mechanics, independent shops, and fleet maintenance teams seeking a durable replacement backed by warranty support.