RedactedNarrative: On Sunday,6-14-15 at 1138 Hrs. This officer was dispatched to the Chesapeake Yachting Center for a report of a boat explosion. The marina is located at 114 Carroll Island Rd., Middle River, MD. 21220. Upon arrival, the fire had already been extinguished by the boat owner and employees of the marina. 
   
  Investigation revealed that during the week, fuel sending units from both fuel tanks had been replaced. When the owner arrived at the boat earlier on this date, he wanted to check the fuel gauges to see if they were working. To do this he had to start the engines. After operating the blower for a period of time, he started both engines without accident. He then wanted to top off his fuel tanks. His boat is docked in the slip directly being the fuel dock. For this reason he did not have to move his boat. The fuel line was pulled to the boat. Owner attempted to leave the blower on, but the fuel person stated that marina policy prohibited this, and it was shut off. Both fuel tanks were topped off, taking just over 44 gallons of gas. Owner turned the blower back on, but had other things to do the boat before he started the engines. He estimated that the blower was on for about 10 minutes before starting the engines. He can't recall if the port engine was running, but when he attempted to start the starboard engine the explosion occurred. 
   
  The deck over the engines was blown overboard. His wife occupant was standing midship when the explosion took place. She fell toward the starboard engine which owner states was on fire. As a result of this wife suffered 2nd degree burns on her arms, legs and hips and was transported to Hopkins Bayview Burn Unit by Medic, where she was admitted. 
   
  A marine surveyor, for Owner's insurance company inspected the boat. He estimates the damage to be $200,000. He also stated that during his inspection, he noticed that where the fuel sending units attach to the fuel tanks, he observed what appeared to be a liquid or moisture, possibly being gas. Surveroy spoke with the company that did the repairs to the boat. Premier Marine, which is located on the property of the marina. He was informed that the mechanic that did the work on the sending units, dropped two of the screws that attach the sending units to the gas tank, in the bilge and could not retrieve them. He went up to the shop and got two other screws to use. It is possible that this gas leaked out the top of the fuel tank. 
   