b gray hit the nail on the head, have a 80 hp merc same thing pump the bulb runs fine leave it for a minute rps drop off, opened up the fuel pump sure enough the diaphram went bad, very simple to replace and the pump kit only costs about 10.00 of course that was 6 years ago couldn't be to much, need any help let me know the hole job took 1/2hr finding all my tools took longer (jk), doug