I am hoping someone has seen this before....we have an older Mercury 65hp outboard, I think its a 71 thunderolt 650(ser#3000829). The problem is in the fuel system. When I pump the bulb to get the fuel lines filled the gas starts spraying out of both carbs. At the top/back of each float bowl there is an overflow hole and it seems like there is to much pressure reaching the carbs. I have blown out both carbs thinking it had something to do with debris but no luck. Should the fuel pump regulate the pressure in the fuel lines to the carbs? I took the fuel pump apart and the baffles seem to be working, no pin holes. I am guessing that maybe the fuel pump assy needs to be rebuilt but since I am working on a tight budget I don't want to be chasing my tail. Any help would be greatly appreciated. Thanks!
