A couple of questions about this system: 1. I've decided to put a fuel water separator on my boat. Which side of the separator should the bulb be on (engine side or tank side)? Or does it matter? 2. Is there a difference between the small and large filters other than capacity? I'm looking at Sierra kit number 18-7852-1. ~$25 3. Once the kit is installed, do I still need the inline fuel filter or will the separator also filter out trash? Thank you in advance for advice and suggestions.