I have a 1987 70 hp evinrude. Ran like new all season but today i was out for about 2 hours and it just quit while at full throdle. fuel is full. It cranks but wont start. new carbs last year. can it flood while running?? it also has good spark and the lanyard is connected. please help. this is the first boat i have owned so this is all kinda new to me. also the hand pump on the fuel line has good pressure. it stays hard. also there is oil comming from the air box. not alot but is that normal??