My 1995 Merc 90 outboard (on a 1990 boat with a built-in fuel tank)will run fine for half an hour to an hour, then gradually lose power and stall or almost stall. If I then go to the fuel bulb (which will be empty) and squeeze it full, the motor will resume running (or I'll be able to restart it if it stalled completely) and run fine. Any ideas out there? One of my friends had a Merc 115 that did the same thing. Is this a Merc thing?<br /><br />Thanks in advance!