On my 1991 Johnson 225 Ocean Runner, I am leaking fuel around the manual release valve in the primer assymbly. I know that this is just replacing an o-ring, but I do not know how to remove the manual valve assembly in order to replace the o-ring. I didn't want to try and remove it and end up breaking something. Also, once I get the o-ring replaced, does anyone know the correct setting for te valve? I think it either points to the right or downward, but I am not sure which position is correct for normal operation. Thank you 