unit 1 was tied off at the gas dock after fueling at wateree marina. blower was on and engine was equipped w/ flame arrester. subject was at rear portside of unit 1 on dock. operator was at drivers seat of unit 1. when the ignition was turned and explosion occured starboard side of the engine compartment. operator sustained cuts and bruises and subject sustained 1st degree burns on right hand and arm. both individuals were transported to kershaw medical center. 

An arc from the electrical system, casued the fumes to ignite.