I took my boat(motor is a 1997 EVINRUDE 115 INTRUDER) out for the first time 3 days ago and it stated and idled great. It even ran good through mid speed. But when I gave it w.o.t it started to spuder a bit. I took it home and drained all of the carb bowls and added some seafoam. I took it back out today and it started and idled great and would even take off fine on acceleration but soon after it would die. I checked the bulb and each time it had lost it's prime. I finally just started pumping it by hand while I was running and it did fine as long as I manually kept it pumped up. Could this be a fuel pump issue or is there anything else I should check. When I prime it the bulb gets tight and does not to appear to be leaking and does not blead down. Thanks for any advice.