How many fuel filters does a 6.7 Ford diesel have?
The 6.7L Power Stroke diesel uses two fuel filters: a primary fuel filter with a water separator and a secondary filter element downstream. This two-stage filtration helps keep fuel clean before it reaches the high-pressure fuel system.
Understanding this setup matters for owners and technicians because it affects maintenance, service intervals, and the symptoms of clogged filters. The filters are part of a dual-filter assembly that requires periodic inspection and replacement per Ford's maintenance schedule.
How the two-stage filtration works
Ford designed the 6.7L Power Stroke with a two-stage fuel filtration system to protect the high-pressure fuel pump and injectors from water and particulates. The primary filter acts as a water separator and coarse filter, while the secondary filter provides finer filtration downstream of the primary stage.
- Primary fuel filter with water separator: removes water and larger contaminants to prevent corrosion and clogging in the fuel system
- Secondary filter element: catches remaining fine particulates just before the fuel enters the high-pressure pump and rail
Regular replacement of both elements is essential to maintain performance and reliability. Always use Ford-approved filters and follow the service schedule in the owner's manual or service guide.
Maintenance considerations
When replacing fuel filters, technicians typically replace both the primary and secondary elements at the same time to ensure consistent filtration. Signs of clogged filters include reduced fuel pressure, hard starting, rough idle, or loss of power; if you notice these symptoms, inspect or replace the filters as part of diagnostic steps.
Summary
In short, a 6.7L Power Stroke diesel has two fuel filters in its filtration system, configured as a primary water-separator filter and a secondary downstream filter. Keeping both clean is key to protecting the high-pressure fuel system and preserving performance.
