MCI D4000 Recall 21V971: Fuel tubes can crack and leak, creating fire risk

What this recall means for you

Certain buses with Cummins X12 diesel engines may have fuel tubes between the fuel rail and the injectors for cylinders four, five, and six that can fatigue and crack. This can cause a high pressure fuel leak. If fuel leaks in the presence of an ignition source, the risk of a fire increases.

Authorized Cummins dealers will repair affected vehicles free of charge. Engines with 75 miles or less will have vibration isolators installed on the fuel tubes. Engines with more than 75 miles will receive new fuel tubes with vibration isolators. Owner notification letters were mailed March 11, 2022.

If you own an affected vehicle, contact Motor Coach Industries customer service at 1-800-241-2947 and ask about recall R21-028. Check your vehicle identification number (VIN) for open recalls to confirm whether your vehicle is included.