Motorcraft FD-4647 Diesel Fuel Filter Kit for 2017–2026 Ford 6.7L Powerstroke
Motorcraft FD-4647 Diesel Fuel Filter Kit for 2017–2026 Ford 6.7L Powerstroke
Maintain reliable diesel fuel filtration with the Motorcraft FD-4647 Fuel Filter Kit, designed for select 2017–2026 Ford Super Duty trucks equipped with the 6.7L Powerstroke engine. This direct replacement filter kit helps remove contaminants and water from diesel fuel to support proper fuel system operation and injector protection.
Designed for compatible Ford diesel applications, the FD-4647 kit includes both the engine-mounted fuel filter and frame-mounted water separator filter for complete service replacement.
What’s Included:
- 1x Engine-Mounted Fuel Filter
- 1x Frame-Mounted Fuel/Water Separator Filter
Key Features:
- Genuine Motorcraft fuel filter kit
- Designed for 6.7L Powerstroke diesel engines
- Helps filter contaminants and water from diesel fuel
- Supports fuel injector and fuel system protection
- Direct-fit replacement design
- Includes both required service filters
- OEM-quality fit and construction
- No modifications required for installation
Vehicle Compatibility:
Compatible with select Ford Super Duty models equipped with the 6.7L Powerstroke diesel engine:
Ford Super Duty
- 2017 Ford F-250 Super Duty 6.7L Powerstroke
- 2017 Ford F-350 Super Duty 6.7L Powerstroke
- 2017 Ford F-450 Super Duty 6.7L Powerstroke
- 2018 Ford F-250 / F-350 / F-450 Super Duty 6.7L Powerstroke
- 2019 Ford F-Series Super Duty 6.7L Powerstroke
- 2020 Ford F-Series Super Duty 6.7L Powerstroke
- 2021 Ford F-Series Super Duty 6.7L Powerstroke
- 2022 Ford F-Series Super Duty 6.7L Powerstroke
- 2023 Ford F-Series Super Duty 6.7L Powerstroke
- 2024 Ford F-Series Super Duty 6.7L Powerstroke
- 2025–2026 Ford Super Duty 6.7L Powerstroke
⚠️ Please verify compatibility using your vehicle year, model, and engine before ordering.
Product Specifications
- Brand: Motorcraft
- Part Number: FD-4647
- Product Type: Diesel Fuel Filter Kit
- Fuel Type: Diesel
- Fitment Type: Direct Replacement
- OEM Reference Number: PC3Z-9N184-C
Cross Reference Numbers
- Motorcraft FD-4647
- Ford PC3Z-9N184-C
Shipping & Handling
- Ships within 1–2 business days
- Tracked shipping available
- Securely packaged for safe delivery
Keep your Ford 6.7L Powerstroke fuel system properly maintained with this Motorcraft FD-4647 diesel fuel filter kit designed for dependable filtration performance.
❓ FAQ
Q: Why does the FD-4647 kit include two different filters, and where are they located on my 6.7L Powerstroke? A: The Ford 6.7L Powerstroke utilizes a dual-stage filtration system to protect the high-pressure common rail (HPCR) injection system.
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The Frame-Mounted Filter (Water Separator): Located along the driver's side frame rail, this is the "primary" filter. It is designed to trap larger particles and, most importantly, coalesce (separate) water from the diesel fuel.
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The Engine-Mounted Filter: Located on the top-rear of the engine valley, this is the "secondary" filter. It uses finer filtration media to capture smaller microscopic particles that could cause catastrophic wear to the high-pressure fuel pump and injectors. Replacing both simultaneously is required to maintain the protection levels intended by Ford engineers.
Q: What is the recommended service interval for the FD-4647, and what are the risks of waiting too long? A: Ford recommends replacing both filters in the FD-4647 kit every 15,000 to 20,000 miles. If you frequently idle for long periods, tow heavy loads, or use fuel from inconsistent sources, consider shortening this to 10,000 miles. Risks of waiting: A clogged frame-mounted filter can starve the fuel pump, leading to premature pump failure. More critically, if the engine-mounted secondary filter fails or becomes restricted, it can allow abrasive contaminants to bypass the element or cause the high-pressure pump to generate internal metal shavings. In a 6.7L Powerstroke, this scenario—often called a "fuel system catastrophe"—can destroy the injectors and the pump, resulting in repairs that can exceed $8,000–$10,000.
Q: What are the exact step-by-step instructions for a clean and air-free filter swap? A: Changing these filters requires strict cleanliness. The 6.7L fuel system is notorious for being difficult to bleed if air is introduced.
Ensure the engine is cool. Place a rag or shop towel around the engine-mounted filter housing at the rear of the engine valley to catch drips. Using a 36mm socket, unscrew the plastic housing cap counterclockwise. Lift the cap and old filter element out together. Remove the old filter from the cap by snapping it out of the locking tabs.
Remove the large rubber O-ring from the housing cap and install the new one provided in the FD-4647 kit, lubricating it with a little clean diesel fuel. Snap the new engine-mounted filter element into the housing cap until it clicks. Thread the cap back onto the housing by hand to ensure you don't cross-thread the plastic, then torque to 25 Nm (18 lb-ft).
Move to the driver's side frame rail. Locate the primary filter housing. If equipped with a drain valve, open it to let the fuel drain into a catch pan. Once drained, use a strap wrench or a dedicated fuel filter wrench to unscrew the entire filter canister. Clean the mounting header surface thoroughly with a lint-free rag.
Lubricate the new filter's top gasket with clean diesel fuel. Crucial: Fill the new filter canister about 3/4 full with clean, filtered diesel fuel before installing; this significantly helps the system prime. Spin the new filter onto the header until the gasket contacts the base, then tighten an additional 3/4 turn by hand.
Do not attempt to crank the engine yet. Turn your ignition key to the "RUN" position (without starting the engine) for 30 seconds. You will hear the fuel pump running. Turn the key to "OFF," wait a few seconds, and return to "RUN." Repeat this cycle 6 to 10 times. This allows the electric lift pump to push air out of the lines and through the return system.
Once you have cycled the key several times, start the engine. It may crank a few seconds longer than normal. Once it starts, let it idle for 5 minutes. Inspect both the engine-mounted cap and the frame-mounted filter for any signs of fuel weeping. If all is dry, your 6.7L is ready for the road.