i have a 1991 merc v200 carburated 2.5l engine. was out on saturday and it ran good for several hours, then all of a sudden died like it was out of gas. primed the engine and nothing. got pulled off of the lake, got home and checked the spark plugs. they were black and smelled burnt, so i figured i fouled them, although they were new. test fired boat at home and ran good in the driveway, so i took it out tonight to see what it would do. ran good for one run tonight, but then started acting like it wes starved for fuel again. spark plugs were clean, and it would run a little way when i hit the primer bulb. this is acting like a fuel pump to me, but i would like someone with more experience to weigh in on this and if it is the pump, how do i rebuild/replace it. thanks for your help