Notice small amount of oil leaking from the bottom of the cowling on my 1999, 115 hp V4, Johnson outboard. Tried to start it yesterday for first time this year and engine kept dying. Lots of white smoke. Took cover off engine but can't see where leak is coming from. Bulb on oil reservoir is holding firm. Bulb on gas line, however, does not hold pressure as well and I noticed odor of gasoline long after discontinuing attempts to start. Any ideas as to what may be causing the oil leak?