Been running my first boat for a couple months now and I've been having a blast and am learning a lot (mostly the easy way so far luckily). I've got some (probably dumb) questions but I'm gonna ask em anyways. My boat's a hog island with Tohatsu 50/35 Jet. 1) My fuel bulb isn't staying tight like I expect it should but my motor is running great and has no problem starting. Should I be concerned? 2) I don't have a fuel/water separator - how important is it really to have one? 3) My motor has an audible, higher frequency rattling sound when I get close to full throttle. First time I noticed it was the same trip I got my first low oil warning. I figured it was probably the metal piece inside the oil tank rattling around since it was in air and not oil, but it's still doing it after filling up with oil. 4) It's about time for me to do my first oil change (I think you're supposed to do one after your first 10 hours?). I'm sure this is a dumb question, but what's the point in changing the oil on a two stroke since the oil is consumed by the engine...seems like it essentially changes itself as I run it?