Changed Fuel/Water Filter- Engine Won't Start

My motor is a Yamaha 150hp Saltwater series. It has been cranking no problem until I changed the fuel/water separator filter (located in my bilge). I disconnected the lines and changed it out. Engine won't crank. Thought maybe air in the fuel lines (still maybe). Disconnected one side of the primer bulb and pumped till fuel was present. Reattached lines, still won't start. Will check batteries to make sure they are fully charged? What else do I need to check?

Thanks

Update

I found the issues. (1) There was some additional air in the fuel line and (2) Main cranking battery wasn't fully charged (around 11.2 volts). Charged it and it fired right up.

Thanks