Boys I'm puzzled. I have a 1997 751 peugot engine it will run for 5 minutes and bog out. the primer bulb is flat you can"t squeeze it. I leave it alone for a while and come back the bulb is full. Pump it a few times and it will run for another 5 minutes. same thing primer bulb is flat again. I went out and bought a another bulb at a small engine place and the same thing happening. I recently put in a new pick up tube and screen and I'm thinking it down far enough. any ideas?