It happened around 2:30 p.m. on Chips Court in the Chips Meadow area of Smithsburg.
The adult male was burned on his face after a small explosion, according to James Ulrich, the chief of operations for Smithsburg EMS.
The victim was removing gasoline from a water craft, and then neighbors reported hearing a loud noise, similar to a cannon or gunshot, Ulrich said.
The man was taken by ambulance to Meritus Medical Center and is listed in stable condition.
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