Ford Super Duty diesel fuel filter leaks investigated by federal police

May 11, 2024 – The National Highway Traffic Safety Administration has opened a federal investigation into 2015-2021 Ford F-250, F-350, F-450 and F-550 Super Duty trucks equipped with 6.7-liter diesel engines .

NHTSA has received at least 27 complaints about Super Duty trucks leaking diesel fuel due to ruptures in the secondary fuel filter housings.

The leaking diesel fuel also led to at least twelve fires in the engine compartment.

According to safety authorities, the Ford Super Duty secondary fuel filter is located near strong heat sources that can lead to thermal events and fires.

NHTSA contacted Allevard Sogefi USA, manufacturer of fuel filters for Ford Super Duty trucks, and learned that the low pressure fuel system can withstand a maximum operating pressure of 8.5 bar, while the secondary fuel filter is only tested to seven bar during the manufacturing process.

The supplier and Ford notified NHTSA of the changes made in 2022, which are consistent with a lack of fuel filter complaints on 2022 and newer model year Super Duty trucks.

NHTSA wants to know whether these production changes made in 2022 fixed the alleged secondary fuel filter leaks in Ford trucks.

The diesel fuel leak investigation involves nearly 211,000 2015-2021 Ford F-250, F-350, F-450 and F-550 Super Duty trucks equipped with 6.7L diesel engines.

CarComplaints.com will update our website with the results of the investigation.