The 6.0L Powerstroke fuel system uses two filters: a primary filter in the frame-mounted HFCM and a secondary filter on top of the engine. It's good practice to service them together. 

Riffraff Diesel’s 6.0L Fuel Filter Set includes both filter elements for 2003-2007 6.0L Powerstroke trucks. The kit is made by Racor (the same filters used originally by Ford), uses part number 3C3Z9N184CB, and supersedes 3C3Z9N184CA, FD-4616, and PFF4616.

Part Link: https://www.riffraffdiesel.com/6-0l-fuel-filter-set/ 

Why it matters

A restricted fuel filter can cause rough running, low power, hesitation, hard starts, poor throttle response, or a truck that falls flat under load. On a 6.0L, clean fuel supply and steady pressure matter because injectors are expensive and fuel starvation is not kind to them.

Ford’s fuel filter service interval is commonly listed at 15,000 miles, with shorter 10,000-mile service under severe use. Trucks that tow, idle, run in cold weather, or see questionable fuel should stay on the shorter side.

Why Racor?

Racor is the OEM option for proper fitment and filtration. Cheap filters often save a few dollars up front, then create cap leaks, poor sealing, restriction issues, or fitment headaches that are not worth chasing.

Key details

• Fits 2003-2007 6.0L Powerstroke
• Includes primary and secondary fuel filters
• Part number 3C3Z9N184CB
• Manufacturer: Racor
• Supersedes 3C3Z9N184CA, FD-4616, and PFF4616

Install

Drain the HFCM, replace the frame-mounted primary filter and O-ring, then replace the upper secondary filter and cap seal. Reinstall both caps carefully, cycle the key to prime the system, start the truck, and check for leaks.

Do not overtighten the caps, and do not reuse old seals. Most fuel filter leaks come from dirty sealing surfaces, bad O-ring placement, or cheap filters that do not fit correctly.

Smart add-ons

If the upper cap is cracked, rounded, or questionable, replace it while servicing the filters with Riffraff's billet option. This is also a good time to inspect the HFCM drain plug, water separator, and check fuel pressure if the truck has hard-start, low-power, or injector-related symptoms.

Bottom line: If you’re searching for an OEM 6.0 Powerstroke fuel filter set, Racor 3C3Z9N184CB, FD-4616 replacement, or 2003-2007 6.0 fuel filters, this is the correct two-filter service kit for keeping fuel supply clean and consistent.