Fuel Filter Hoses May Disconnect and Leak Fuel

Affected vehicles (1)

Component / system

Defect

Cummins, Inc. (Cummins) is recalling certain Cummins L9 diesel engines with part number D563027BX03. The remote fuel filter hoses may become separated from the fitting, which can result in a fuel leak and a lack of fuel supply to the engine.

Risk / consequence

A fuel leak in the presence of an ignition source increases the risk of a fire. Additionally, a lack of fuel can cause an engine stall, increasing the risk of a crash.

Remedy

Dealers will replace the fuel filter hoses, free of charge. Owner notification letters were mailed in July 8, 2024. Owners may contact Cummins customer service at 1-800-286-6467. Cummins number for this recall is C7032.

Chronology of events

1. Mar 27, 2024

   3/27/2024 – Cummins was informed of fuel leaks on the subject hoses during vehicle production by an OEM (Nova Bus).

2. Mar 27, 2024

   3/27/2024 – 4/9/2024 – Cummins requested the failed parts from the OEM for failure analysis. Cummins initiated and completed an investigation into the cause of the leaks. A preliminary fault tree analysis identified insufficient crimping of the hose fitting as the most likely cause of leaks.

3. Apr 10, 2024

   4/10/2024 – 4/29/2024 – Cummins continued to investigate the issue and determined that the cause of the fuel leaks was insufficient crimping of the connector.

4. Apr 29, 2024

   4/29/24 - 5/1/24 – Cummins conducted a product safety investigation. A warranty search identified 15 warranty claims with failure dates between 6/9/2023 and 4/17/2024 for fuel leaks involving engines equipped with these options. Cummins conducted a Product Safety Hazard Analysis to evaluate the potential safety risk on fielded units.

5. May 7, 2024

   05/7/2024 -5/14/2024 – Cummins escalated the issue through its Product Safety Defect Determination Process.

6. May 14, 2024

   5/14/2024 – Based upon the results of the investigation, the Cummins Product Safety Defect Board decided to conduct a safety campaign to address this condition. To date, there have been no reports of fires, accidents or injuries related to this issue.

Notification schedule

Dealer notification

JUL 11, 2024 - JUL 11, 2024

Owner notification

JUL 21, 2024 - JUL 21, 2024

Documents (25)