Recall 21V312 affects 1,053 2018-2022 Blue Bird All American buses for a fuel rail leak that risks fire. Free repair once Blue Bird opens it.
Blue Bird is recalling 1,053 of its 2018-2022 All American and All American School Bus vehicles under recall 21V312 because the sealing washer in the high pressure fuel rail assembly can fail to seat correctly, allowing fuel to leak. A fuel leak near an ignition source raises the risk of a fire, and the final dealer repair will be free once Blue Bird opens it.
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What's wrong?
The high pressure fuel rail on these Blue Bird All American buses is part of the Cummins L9 diesel fuel system. It holds diesel fuel under very high pressure and feeds it to the injectors at each cylinder. Sealing washers at the ends of the rail keep that pressurized fuel from escaping where the rail meets the fuel lines.
On affected buses, the pilot bore holes that hold those sealing washers were machined undersized. The washer does not seat fully into the bore, so the joint never gets the clamping load it needs. Over time the seal loosens and pressurized diesel fuel leaks out of the rail end. Leaking diesel near a hot engine is a fire risk, especially on a school bus carrying children.
The driver or operator will often see or smell diesel fuel around the engine. In some cases the check engine light comes on. Both are warning signs that the rail seal has started to fail.
Who's affected?
Covers two All American body styles across five model years (2018-2022), all built with the same Cummins high-pressure fuel rail assembly.
| 2019 Blue Bird All American | fuel system |
|---|---|
| 2022 Blue Bird All American School Bus | fuel system |
| 2020 Blue Bird All American School Bus | fuel system |
| 2021 Blue Bird All American School Bus | fuel system |
| 2018 Blue Bird All American | fuel system |
| Units affected | 1,053 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific bus is included in this recall.
What's the safety risk?
A diesel fuel leak near an ignition source raises the risk of a fire. Watch for visible fuel, a strong diesel smell, or an illuminated check engine lamp, and stop driving the bus if any of those appear. Park it away from buildings and other vehicles until the dealer inspects it. Repair will be free at any franchised Blue Bird dealer once available.
What should I do?
- Check your VIN to confirm your 2018-2022 Blue Bird All American bus is included in this recall.
- Wait for the final repair instructions from Blue Bird. The remedy is still under development, and owner letters were mailed on July 30, 2021.
- Call Blue Bird customer service at 1-478-822-2242 with questions, and reference recall number 21V312 (Blue Bird recall R21BH-SB) when you call.
- Watch for a fuel smell or visible diesel leakage near the engine, since a leaking high-pressure fuel rail can ignite if it meets an ignition source.
- Contact your franchised Blue Bird dealer once the fix opens to schedule the free sealing-washer and fuel-rail repair that stops the leak.
What happens at the repair
The final dealer repair is still being developed by Cummins and Blue Bird, so it cannot be scheduled yet. Once the remedy is released, a Blue Bird technician will service the high pressure fuel rail assembly and correct the sealing washer seating in the pilot bore holes to stop the leak. Parts and labor will be free of charge under the recall once the repair opens. For units not covered by the existing limited warranty, Blue Bird has stated a recall-specific reimbursement plan will be posted in the Recall Portal. If you previously paid out of pocket for related fuel rail leak repairs, contact Blue Bird customer service at 1-478-822-2242 and reference recall number R21BH-SB to ask how to submit documentation once the plan is published.
| Reimbursement | Reimbursement available |
|---|
Timeline
| May 4, 2021 | NHTSA published the recall |
|---|---|
| June 30, 2021 | Dealer notification began |
| June 30, 2021 | Dealer notification ended |
| June 30, 2021 | Interim owner notification (was planned for this date) |
| July 30, 2021 | Owner notification mailed |
Frequently asked questions
What is recall 21V312?
Recall 21V312 covers 1,053 2018-2022 Blue Bird All American school buses. The sealing washer does not seat correctly in the pilot bore holes, which can let the high-pressure fuel rail assembly leak. A fuel leak near an ignition source increases the risk of a fire.
What should I do if my 2018-2022 Blue Bird All American is on this recall?
Check your VIN to confirm your specific bus is included in recall 21V312. If it is, contact Blue Bird customer service at 1-478-822-2242 and reference Blue Bird's recall number R21BH-SB. The final repair is still under development, and Blue Bird will send a follow-up notice once the remedy is ready.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair the defect at no cost. Blue Bird will perform the fuel-rail repair free of charge once the final remedy is released. Parts and labor are covered through the franchised Blue Bird service network.
When will the repair be available?
The remedy for recall 21V312 is still under development. Blue Bird mailed initial owner notification letters on July 30, 2021, and will send a second notice once the final repair is ready. In the meantime, fleet operators should contact Blue Bird at 1-478-822-2242 for current guidance.
What warning signs should I watch for?
Watch for the smell of diesel fuel around the engine compartment, visible fuel residue or drips near the high-pressure fuel rail, and any fuel-related warning indicator on the dash. If you notice any of these signs, park the bus away from ignition sources and contact Blue Bird customer service at 1-478-822-2242.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V312000 |
|---|---|
| Blue Bird customer service | 1-478-822-2242 |
| NHTSA recall # | 21V312 |
| NHTSA recall # (full) | 21V312000 |
Source documents
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Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Investigation Document (PDF) (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 24, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →