I'd suggest having a chat with marine
mechanics in your area. Get some idea of how good they are, how available and how much they charge.
On the iceberg theory your injector pipe may represent 10% of the work needed on your engine
. You need to find out what can be kept going, what must be fixed and to work out a maintenance
If you do get a mechanic
get him/her to show you how to change the oil
(gearbox and engine), filters (fuel, air, oil
and raw water) and raw water
impeller. If you can find spares for these (they may be on the boat already) even better.
A good mechanic
could also make suggestions to improve reliability
(like adding a primary filter for instance).