You folks recall my "adventure" of sailing into the slip a couple weeks ago, after the engine died, right? (still jazzed that it all came together so well)
I pulled the main filter as was suggested (2 micron) and after finally getting the inspection/separator bowl off (rusted onto the filter, even though it is plastic). I am looking at the procedure to clear the fuel line of air. There is a drawing of the fuel system supplied by PSC that shows the primary pump (which I have yet to find) the primary filter, and the secondary pumps and filters and there is a writeup on this drawing telling you to basically follow the flow and ensure that at each possible point you ensure that there is no fuel in the line. OK sure, I understand that. Have done this on one other boat when we ran dry on one tank and had to switch over... did the whole thing using the little lever on the final high pressure pump.
PSC suggests shutting off the raw water intake to crank the engine while eliminating the air in the system. There is also a warning label in "engine compartment" about not cranking the engine for over 10 seconds, all no doubt to ensure that sea water doesn't get into the exhaust manifold.
So here is the catch-22. The engine manual says don't run the raw water pump dry as it will break the impellers.
So what would you do? This is a 2GM20F Yanmar.
I am going to first look harder for the primary fuel pump... came down with the flu (I even had the darn shot) so I wasn't too keen on scrambling about looking for it last weekend.
One idea I have is to energize the fuel pump with a jumper wire to pressurize the system, to allow me to at least minimize the air in the lines without cranking the engine... then I'll use the little lever on the high pressure pump to do that last bit to the injectors. The engine has typically started in about 2-3 cranks in the past.
BTW the filter had what looked like about a 1/4-1/2 teaspoon of sand/ fine particles in it, otherwise no water, and the fuel looks good, clear and red.