snds like fuel pump...but start at the vent and work your way to the engine. Check everything. Make sure its venting...make sure it has a good pick up and its working...check your hose, connections, and bulb. A bad bulb can cause this too. Those pumps aren't very strong. Thats why you have a bulb in the first place. Check all your under cowling hoses. Check filters. Then do the pump. They are easy also. Most are just diaphram pumps. BE SURE to follow directions on how they go together. Also, if you order from iboats or a place like that...make SURE there isn't a recall or changed part or discarded part. Ran into that with a Blackmax I did. Got kit from iboats...tried to rebuild but parts didn't all match up and ruined kit. Went and got a Merc kit and it had a paper talking about the part change...the sierra part from iboats did not. Just some FYI so you don't have to buy extra stuff. Rule out easy and cheap stuff first.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15