Guys ; A week or so ago I made a post on this topic that seems to have disappeared, but anyway it's a Critical item to check !
There are only a few absolute critical items to check on a C34 :
1. Wiring Harness - if not changed you can have a FIRE on board!!
2. Old Style Alternator Bracket - if you have an M25(21hp) engine with the old style alternator bracket (over the top), that bracket will break, puncturing the oil filter RUINING the engine and alternator !!
3. Screen in the Fuel Pick-up Tube - eventually that screen will become clogged and the engine will STOP from fuel starvation !!
I keep bringing these up because year after year because I keep seeing pictures of boats on this message board that show that critical items 1 & 2 have NOT been done and have to be pointed out to the owner!!
In the case of the pick -up tube screen, there will never be a picture for any of us to point out to that owner and it isn't an obvious thing for a mechanic to check. After a mechanic has spent a few hours @ $$$/hr on why the engine isn't getting any fuel, he will finally check for that screen $$ later!!
Here's the problem that I described back in the early 1990's:
Catalina procured their fuel tanks from a manufacturer that put screens in the pick -up tubes for mainly gasoline applications.
That tubular VERY VERY fine mesh screen fits inside the 3/8" fuel hose. It is crimped at the end and sealed with a fuel resistant sealant. Then that screen is inserted in to the fuel hose leaving only a half inch or less of surface screen exposed to filter the the diesel.
As we all know microscopic water particles in the diesel fuel tend to grow algae in diesel.
The bottom line is to remove the screen and let your Racor filter do it's job, because the screen will get clogged with that algae and the engine will quit at the most inopportune time - guaranteed!!