Recall 21V620 covers 9 2017-2021 Custom Fire emergency vehicles with Cummins L9 fuel rails that can leak. Repair is free at a franchised Peterbilt dealer.
Custom Fire is recalling 9 2017-2021 Peterbilt 348, Freightliner M2, Kenworth T880, and Kenworth T370 emergency vehicles because a sealing washer in the Cummins L9 high-pressure fuel rail can leak fuel. A fuel leak near an ignition source increases fire risk, and a Peterbilt dealer will complete the free repair.
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What's wrong?
The high-pressure fuel rail on these Custom Fire 2017-2021 emergency vehicles feeds diesel fuel to the engine injectors. In the Peterbilt 348, Freightliner M2, Kenworth T370, and Kenworth T880 models named in this recall, the Cummins L9 diesel engine depends on that rail to hold fuel pressure while the engine runs.
The problem is at the sealing washer in the fuel rail assembly. That washer is supposed to sit squarely in the pilot boreholes, which are the machined openings that help locate and seal the rail hardware. If the washer does not seat correctly, the seal is incomplete and the high-pressure fuel rail assembly leaks diesel fuel.
There is no warning sign before failure. Custom Fire says a physical inspection is required, so owners should not rely on a dashboard light or visible leak to know whether the fuel rail assembly is affected.
Who's affected?
Spans four chassis models from 2017-2021, all tied to the Cummins fuel rail assembly.
| 2020 Custom Fire Peterbilt 348 | fuel system |
|---|---|
| 2017 Custom Fire Freightliner M2 | fuel system |
| 2018 Custom Fire Kenworth T880 | fuel system |
| 2019 Custom Fire Peterbilt 348 | fuel system |
| 2018 Custom Fire Kenworth T370 | fuel system |
| 2020 Custom Fire Kenworth T370 | fuel system |
| 2020 Custom Fire Kenworth T880 | fuel system |
| 2021 Custom Fire Kenworth T370 | fuel system |
| 2019 Custom Fire Kenworth T880 | fuel system |
| 2017 Custom Fire Peterbilt 348 | fuel system |
| 2021 Custom Fire Freightliner M2 | fuel system |
| 2017 Custom Fire Kenworth T880 | fuel system |
| 2017 Custom Fire Kenworth T370 | fuel system |
| 2019 Custom Fire Freightliner M2 | fuel system |
| 2020 Custom Fire Freightliner M2 | fuel system |
| 2019 Custom Fire Kenworth T370 | fuel system |
| 2018 Custom Fire Freightliner M2 | fuel system |
| 2021 Custom Fire Peterbilt 348 | fuel system |
| 2018 Custom Fire Peterbilt 348 | fuel system |
| 2021 Custom Fire Kenworth T880 | fuel system |
| Units affected | 9 |
The year, model, and chassis make narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A fuel leak near an ignition source increases the risk of a fire. There is no warning sign before the defect is found; a physical inspection is needed. Schedule the recall work soon and use a franchised dealer for the inspection and any needed fuel rail replacement. Repair is free at any franchised Peterbilt dealer.
What should I do?
- Check your VIN to confirm your 2017-2021 Custom Fire Peterbilt 348, Freightliner M2, Kenworth T880, or Kenworth T370 emergency vehicle is included in this recall.
- Contact a franchised Peterbilt dealer to schedule the free Cummins fuel-rail inspection that addresses the high-pressure fuel rail leak risk.
- Bring the recall notice if Custom Fire mailed one, or reference recall number 21V620 when you call.
- Avoid parking or operating near ignition sources if you see or smell a fuel leak, and keep the vehicle out of service until a dealer inspects it.
- Call Custom Fire customer service at 1-715-294-2555 with questions about the recall or repair path.
What happens at the repair
At the dealer, a Peterbilt technician inspects the fuel rail threads and fuel lines on the Cummins L9 diesel engine. If the fuel rail shows the recall condition, the technician replaces the rail. The recall repair is free, with parts and labor covered. Custom Fire has a general reimbursement plan on file for this campaign, so owners who already paid for the same fuel rail repair should contact Custom Fire customer service with repair documentation.
| Reimbursement | Reimbursement available |
|---|
Timeline
| August 6, 2021 | NHTSA published the recall |
|---|---|
| August 9, 2021 | Owner notification mailed |
| August 9, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V620?
Recall 21V620 covers 9 Custom Fire emergency vehicles from 2017-2021 with Cummins L9 diesel engines. The sealing washer can fail to seat correctly in the pilot boreholes and let the high-pressure fuel rail assembly leak. Cummins will inspect the rail threads and fuel lines, then replace the rail as needed for free.
What should I do if my 2017-2021 Custom Fire Peterbilt 348, Freightliner M2, Kenworth T880, or Kenworth T370 is on this recall?
Check your VIN to confirm your specific emergency vehicle is included in recall 21V620. If it is, contact Custom Fire customer service at 1-715-294-2555 and ask for the Cummins fuel-rail inspection and repair path. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to provide the recall remedy at no cost, and the remedy for recall 21V620 says Cummins will inspect the rail threads and fuel lines, then replace the rail as necessary, free of charge.
What is the safety risk?
The safety risk is fire. A leaking high-pressure fuel rail assembly can release diesel fuel, and a fuel leak near an ignition source increases the risk of a fire. Confirm the VIN, then arrange the free Cummins inspection and repair through Custom Fire.
When were owners notified about recall 21V620?
Owner notification letters were mailed on August 9, 2021. If you bought the emergency vehicle used or never received a letter, the VIN still decides whether the free repair applies. Reference recall 21V620 when you contact Custom Fire.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V620000 |
|---|---|
| Custom Fire customer service | 1-715-294-2555 |
| NHTSA recall # | 21V620 |
| NHTSA recall # (full) | 21V620000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →