Multiple crews battling the Tasman fire were briefly sent to put out a blaze near Motueka.
Emergency services were called to the fire on State Highway 60 about 8.20am.
Fire and Emergency said the blaze happened in a shed - 3m by 4m in size.
It said crews managed to contain the blaze within half an hour and prevent it from spreading to a cool store next door.
Fire and Emergency said the fire was extinguished about 10am.
Investigations are underway.