I've got a 2012 GTR 215 and will make a video on installing the pump eventually. There are a few scenarios that will require the aid of a bilge pump: 1) the carbon ring fails catastrophically (normal wear is not a big concern, as it will cause leakage that the built-in bilge system will take reasonable care of, and you'll see it left with more and more water in the hull - so plenty of warning); 2) one of the water-bearing hoses comes loose/off (this is normally due to clamp failure, and can be avoided by constantly checking up on your hoses and clamp condition); 3) your pump fails (i.e. water gets in) and the drive shaft slides forward, unsealing your carbon ring; and 4) you get a hole in your hull. There's not much you can do about the #4 scenario, except get it quickly out of the water. As you can see, almost all of the scenarios involve maintenance issues, and are not expected in newer machines. I'm planning on installing a bilge pump, but not until it's about 5 years old. Even then, it's probably a bit premature. I had a pump failure on a 10-year old Sea-Doo machine I had that unsealed the carbon ring and water filled up the hull (like in that video you're referring to), but it didn't sink completely. You can still drag it along the water, although the engine will likely flood (like mine did). It was a total disaster, but I didn't act on noticing the pump oil seals were pitted. I should have replaced the entire pump before it failed, but live and learn! Good luck!
