Hastings FF949 Fuel Filter - Secondary

Fuel Filter for Heavy-Duty Applications

The Hastings FF949 is a fuel filter for select heavy-duty trucks that use a secondary element configuration. It is built for applications that call for OE number 6436719 or 6437284, depending on the vehicle, and it supports clean fuel delivery in older Freightliner and White platforms.

Key Features

• Secondary fuel filter element for select commercial truck applications
• Application-specific fitment for Freightliner and White models
• Matches OE references 6436719 and 6437284 for listed vehicles
• Fits select Autocar, Freightliner, and White trucks from 1981-1987

Detailed Description

Hastings FF949 is a replacement fuel filter for heavy-duty fuel systems that use a secondary element. Fitment includes 1987 Freightliner FLC112, 1981 Freightliner FLT086, 1983 Autocar C / DC, 1985-1986 Autocar ACL, and select White WCM, WIM, WHS, and WIL models. This part number, FF949, is listed with OE cross references 6436719 and 6437284 for the applications shown, making it a direct reference point when matching the correct filter to the vehicle.

What It Is Used For

• Replacing a worn or restricted secondary fuel filter element
• Restoring proper fuel filtration in listed heavy-duty trucks
• Addressing fuel delivery issues caused by contamination buildup
• Supporting maintenance on older commercial diesel fuel systems

Installation Notes and Tips

Verify the vehicle's OE filter number and confirm the secondary element configuration before ordering. Match the application details exactly, including the listed model and year, because FF949 is not a universal filter. For fitment-specific service work on Freightliner and White trucks, compare the existing filter dimensions and OE reference before installation.