“Ran out of gas.” Riiiiiiiight!
“I ran out of gas. I... I had a flat tire. I didn’t have enough money for cab fare. My tux didn’t come back from the cleaners. An old friend came in from out of town. Someone stole my car. There was an earthquake. A terrible flood. Locusts! IT WASN’T MY FAULT, I SWEAR TO GOD!”
Close. Contaminated Fuel. If this is the same boat I looked up it's a twin engine boat. If one is down due to that engines failure it should in theory limp in on one. So what would disable both engines putting a boat Dead In Water? A fuel issue is all I can think of mechanically unless there was some shared electronic control. The most common fuel issue is contamination. Although they run on DFM, JP5, or JP8, it seems there has been some bio-fuel testing as well.