I have a fuel problem with my 40 HP outboard. When I give it throttle it runs for about 100 yards and then it stalls. The bulb on the fuel line from the tank to the engine is soft. I have replaced the bulb and lines, the fittings, the inline fuel filter, and the gas tank. I have checked as best I can for air leaks using an air compressor. After doing all of this it ran twice around the lake and I thought I had it solved until I throttled back to land it and it stalled. Back to square one. Now I have ordered a fuel pump kit. Is there anything I am missing?