Dorman 904-458 Fuel Pressure Relief Valve Cap

Fuel Pressure Relief Valve Cap Overview

Dorman 904-458 is a direct replacement fuel pressure relief valve cap for vehicles with a fouled or leaking original cap. Built from aluminum with a silver finish, it is made to match the original fit and restore proper sealing at the fuel pressure relief point. This part is a practical service solution for Ford E-350 Club Wagon, E-350 Super Duty, Excursion, F-250, and F-350 applications.

Key Features

• Direct replacement for the original fuel pressure relief valve cap
• Aluminum construction for durable service
• Silver finish
• Measured length: 1.65 in.
• Inside diameters: 0.38 in. and 0.5 in.
• Outside diameter: M14-1; 1 in.
• Fits Ford truck and van fuel system applications from 1998-2003

Detailed Description

This Dorman fuel pressure relief valve cap, part number 904-458, is built as a direct OE-style replacement for a damaged or leaking original cap. It is manufactured from aluminum and tested for fit and performance to help maintain proper sealing at the fuel pressure relief location. This part cross-references Ford F81Z9H323BB and 1831444C91 for the same application. For buyers searching for a fuel pressure relief valve cap for a 1999-2003 Ford F-250 Super Duty or a replacement fuel pressure relief valve cap for a 2000-2003 Ford Excursion, 904-458 provides a straightforward service part match.

Common Repair Reasons

• Fuel pressure relief cap is leaking
• Original cap is fouled, damaged, or worn
• Fuel system sealing issue at the relief valve cap
• Need to restore proper fit on a Ford E-350 Super Duty, F-350, or Excursion fuel system
• Replacement for a missing or deteriorated OE cap

Installation Notes and Tips

Verify the outside diameter, inside diameters, and thread specification before installation. Confirm vehicle application by year and model, especially on 1998-2003 Ford E-350 Econoline Club Wagon, 1999-2003 Ford F-250, and 1999-2003 Ford F-350 Super Duty platforms. Inspect the sealing surface and surrounding fuel system components for wear or contamination before installing the new cap.

Quality Assurance

Dorman tests this replacement cap for proper fit and performance. The part is made from quality materials to support consistent service in the specified Ford applications.