I have what i believe is 1967 28hp johnson. It had good water stream when I was working on it in a garbage can. The water in the can got a little low and as soon as i noticed it i shut it down . it was not very long at all . Now when i start it it takes a little time for water to start coming out? is this normal or should i consider replacing the water pump? Any hepl would be great . I am new to boating and just dont know how things work. I am very handy and could fix most things with a little help.