The Racor RK31449 is an OEM-grade replacement fuel filter bowl lid designed for the factory fuel filter housing on 1999–2003 7.3 Powerstroke engines. As the original equipment supplier for Ford’s fuel filtration systems, Parker Racor manufactures this cap from high-strength, fuel-resistant composite polymers to match original factory dimensions. It features an integrated 1/2-inch square ratchet drive socket on top and includes the pre-packaged square-cut O-ring seal to ensure a leak-free closure.

Cracked lid flanges, rounded-off or stripped drive hexes, and warped sealing surfaces from previous overtightening are what this replacement cap fixes. Many aftermarket "all-in-one" fuel filters come with integrated disposable lids that bypass OEM sealing geometry or lead to cross-threading when swapped. Using the Racor RK31449 restores the factory two-piece configuration, allowing the re-use of standard drop-in filter elements (like the Racor PFF4596 or Motorcraft FD-4596) without having to replace the entire cap assembly every service. It is the replacement fuel filter bowl cap and lid seal only; the fuel filter element and aluminum fuel bowl housing are sold separately.

It fits 1999–2003 7.3 Powerstroke Super Duty trucks, Excursions, and E-Series vans equipped with the factory fuel filter bowl assembly.

Fitment

• 1999–2003 Ford F-250 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-350 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-450 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-550 Super Duty 7.3L Powerstroke
• 2000–2003 Ford Excursion 7.3L Powerstroke
• 1999–2003 Ford E-Series Vans 7.3L Powerstroke
• Navistar T444E diesel engines
• Direct OEM replacement for factory two-piece fuel filter caps
• Durable composite construction with 1/2-inch drive socket
• Includes square-cut replacement lid O-ring seal
• Filter bowl cap and seal only

Ensure the fuel filter bowl threads and top bevel are wiped clean of grit or old rubber debris before installing the cap. Coat the included square-cut O-ring seal liberally with clean engine oil or diesel fuel and seat it squarely into the lid groove to avoid pinching. Start the cap threads by hand to prevent cross-threading the aluminum housing, then tighten down using a 1/2-inch ratchet until the cap flange seats fully against the top of the bowl—do not over-torque or use impact tools.