Many people do not bother to start their engine
on the hard before being launched but you definitely can if you want to. It sounds like this is a
new boat to you so it would not be a bad idea. The easiest way to do this is to put a 5 gallon bucket next to the engine room and remove the
raw water intake hose from the seacock and put it into the bucket. Then fill the bucket most of the way with a garden hose. You will need to be ready to regulate the flow out of the garden hose so that the amount of the water in the bucket doesn't get too high or low once the engine is running.
In my opinion, the best way to figure out where all of your filters are is to follow the
plumbing of the engine. If you follow the
fuel line from the tank (there will be 2, you want the send which is often larger diameter) you should run into at least one if not 2
fuel filters, a
lift pump and finally the injection
pump which has rigid fuel lines going to your injectors. Unless you have a
remote oil filter, the only part of the
oil system that you will see is the
oil filter. For
raw water, the line will come from a sea cock, go to a strainer (very coarse filter) then to the
water pump and then to your engine. The raw water usually exits into the
exhaust on cruising sailboats. Since we don't know the specific engine or
boat, it is hard to be more specific on where these items will be.
The only things that you absolutely have to do before launch relate to making sure that the boat floats. It is advisable to launch with all of your seacocks in the closed position. Also, you should check to make sure that all of the hoses coming off of them are securely clamped and in good condition. If you haven't changed your zincs or painted the bottom, those would be good things to do before launch as well. Prep
work is always easier when on the hard so do whatever else you can but it isn't 100% necessary to the boat floating. It sounds like your
lifelines are off so installing them sounds like a good idea.
What make and model boat is it?