Re: Yanmar YSE8 no secondary filter - 2 micron racor in primary?
So, if what I've read is correct, the YSE8 didn't have a secondary on the engine itself, but it was mounted on a bulkhead in some cases. Have you traced the fuel line all the way from the primary to the engine to make sure there isn't one somewhere along the way? Probably you have, but just checking. Don't know what kind of fuel pump you've got, but 2 microns is a pretty small straw to be sucking through for the diaphragm types.
2000 Beneteau 331
Northern Chesapeake Bay
Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright