Re: yanmar yse 8hp fuel pump?
Firstly, I feel ya. Good diesel engine mechanics who are willing to bust their backs crawling into weird tiny spaces on small sail boats are hard to find.
Especially since, if they are actually good at what they do they can make three times as much working on rich peoples fancy yachts. A mechanic told me this while I was going through a similar issue trying to get somebody to take a look at my yanmar yse 8 and the lady who ran the best dealer ship around died a month before I began working on my engine.
Secondly, if it is the electric fuel pump we are talking about you should hear a tickticking sound when you start your ignition (I have a switch I pull out and some lights turn on) I'm wondering if it could be as simple as a wiring problem?
I also have a fuel shut off valve on my in line.
Good luck! Also the mechanic who rebuilt my motor doesn't return my phone calls either but usually after the 5th or 6ht time I call I catch him and he says he will come take a look at it but that has yet to happen since I bought the boat 2 years ago.