Such as don't take your big slow moving boat out in a named storm???

I'll have to look and see if I can find anything on what the filter rating should be.

I've done quite a bit of reading about my little 2GM20F in the last week... (finally found a complete manual written only in english with good illustrations.) It actually shows exactly where the bleed screw is located on the secondary filter... I never bled that. Looks like Yanmar realized the error of their ways with the GM series and has discontinued them (oh joy) and recommends a newer engine with a Y in the series name... that is designed for easy maintenance... such as front mounted raw water pump and forward access to the oil dipstick and filler port.

I'll hit it with a new passion Saturday. Wish me luck.