If the light is expected to get kicked & thrashed, fall into bait buckets, fall into the bilge, have the gas can tip over onto it, fall in the head, or knock around inside a perpetually wet storage bay when not being used, you might want to go with any of the Trek or Expedition lights. They're all rated to no less than 300 feet, and they should be fuel-resistant, at least for short exposure. No guarantees on the rubber cussion part of the lanyard with regards to gasoline, but I think the rest of the flashlight will shrug it off with no permanent damage except maybe a faint, lingering gasoline odor.
If you're going to at least try and protect it from prolonged and deep submergence, or if you actually expect it to go overboard now and again and don't want to see your flashlight go blub blub blub all the way to the abyss, then the Eternalight Ergo Marine with lithium batteries may be a better option. It's a bit more delicate and less submergible, but when used with lithium batteries, it floats if it goes over the side. Just remember to scoop it out of the water with something other than the gaff hook.