Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.
NAPA Gold · Filtration
3655
In stock · ships from Knoxville
This is a cartridge-style fuel/water separator filter element for heavy-duty diesel engines.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 4 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Freightliner
Other applications
Freightliner
Other applications
Always verify the fuel/water separator housing on the vehicle. Cross‑reference numbers include WIX 33655, Fleetguard FS19915, and Baldwin PF9804 – if your housing takes those, this filter matches.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 12 of 12.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It removes water and fine contaminants (down to 7 microns) from diesel fuel before it reaches the injection system, protecting pumps and injectors. The filter fits into a Davco Fuel Pro 482 or similar remote-mount fuel/water separator housing. Routine replacement helps maintain engine performance and prevents costly fuel system damage, especially in high-mileage commercial trucks.
Part Number: 3655
FUEL FILTER
Category: Filters
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
