I just replaced complete water pump and lower gear lube. Replaced old fuel, and spark plugs. I noticed the primer bulb doesn't stay firm. It cranks over but will only hit if I spray in a little starter fluid but then dies rt away. This is my first boat and attempt at starting it. I removed the fuel screen and can blow through it. Is there carb cleaner I can try to see if something is stuck? Thanks for help in advance.