2017–2021 Custom Fire Freightliner M2, 2017–2021 Custom Fire Kenworth T370, 2017–2021 Custom Fire Kenworth T880 and 1 other model Recall: Sealing washer may not seat correctly in the pilot boreholes, allowing the…
NHTSA campaign 21V620000 · Fuel System, Diesel · filed Aug 6, 2021 · verified Jul 30, 2026
The defect
Custom Fire Apparatus, Inc. (Custom Fire) is recalling certain 2017-2021 Peterbilt 348, Freightliner M2, Kenworth T370, and T880 emergency vehicles equipped with Cummins L9 diesel engines. The sealing washer may not seat correctly in the pilot boreholes, allowing the high-pressure fuel rail assembly to leak.
The risk
A fuel leak in the presence of an ignition source increases the risk of a fire.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Cummins will inspect the rail threads and fuel lines, and replace the rail as necessary, free of charge. Owner notification letters were mailed on August 9, 2021. Owners may contact Custom Fire's customer service at 1-715-294-2555.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
| Make | Model | Model years |
|---|---|---|
| Custom Fire | Freightliner M2 | 2017, 2018, 2019, 2020, 2021 |
| Custom Fire | Kenworth T370 | 2017, 2018, 2019, 2020, 2021 |
| Custom Fire | Kenworth T880 | 2017, 2018, 2019, 2020, 2021 |
| Custom Fire | Peterbilt 348 | 2017, 2018, 2019, 2020, 2021 |
Related recalls
Other campaigns involving Custom Fire vehicles
All Custom Fire Freightliner M2 recalls → · All Custom Fire recalls →
Source: NHTSA recall database, campaign 21V620000 (manufacturer number 21E032). Data last verified Jul 30, 2026.