i have a 1993 envinrude 90 hp. the engine has run fine for the past three years till about two trips ago. the boat will get up on a plane when u give it throttle but then after about a minute it dies down to an idle. when i check the fuel bulb its empty. if you pump it and fill it, it will get on a plane till the fuel runs out of the bulb. i have changed the fuel lines from the bulb to the motor and all inside the cowling to the fuel pump in fear of an air leak on a dry rotted hose. changed water seperator and fuel filter inside of engine cowling. i have also changed the spark plugs. i am just curious if any one has had this problem before and has some suggestions before i start pulling carberators or change the fuel line from the tank to the bulb..