I have a 1996 C-Series 115 Yamaha. I have cleaned the carbs, cleaned the inner fuel filter, replaced the fuel lines (from tank to engine), replaced racor fuel/water separator, and replaced the fuel pump. Sometimes after starting and warming up it will bog on acceleration and die. It seems to idle fine.It may do this for 5-10 throttle attempts and then it runs fine for the rest of the day. I checked the fuel bulb and is is not going flat when I experience the problem. I assume it is a fuel restriction problem but its intermittent nature makes it hard to troubleshoot. I tried to replace the builtin fuel tank pickup line but it is basically frozen and I cannot access it very easily to put any leverage on it. It may be the backflow preventer but I cannot replace that as it is part if the fuel pickup line in the tank. Any help would be appreciated.
