I have a 1987 Sierra boat with a 90 hp motor. Also, there is a mounted gas tank within the boat. My problem is that the boat starts up fine but after opening the throtle the engine bogs down and slows right down. I have tried many things to fix it from what I have read on here. The first thing I have done was attach a portable gas tank to my motor with a different bulb and hose. When I did this it ran perfectly fine and had no problems. So this makes me think that it is some sort of fuel problem. I have replaced the bulb and that is not the problem. From what I read, it is either a hole in the hose, the gas in the tank is bad, or the anti-siphon valve is bad. My question is am I on the right track or is there something else? Also, what should I try to do next? And finally, where is the anti-siphon valve located and how do you remove it and fix it? Any help would be appreciated. Thanks
