Most Westerbekes have an electric
lift pump. I have a 46 model.
This means that when you turn on the ignition key, you should be able to hear the rapid clicking of the fuel pump
running when you are near the engine and listen.
So, if you need to prime the engine you can just turn on the ignition for like 45 seconds and try a start, if it does not start (due to fuel) keep the ignition key engaged for another minute and a half and then try starting the engine again.
If it still doesn't start, I would try another 1.5 minute cycle and if that does not work, you may want to try and use the manual pump.
The manual pump on my engine is a little horizontally mounted disc above the engine fuel filter
(not the Racor) on the top, front, right of the engine. Yours may be located elsewhere. Anyhow, something like 80 pumps of that little sucker will usually move enough fuel into the system to get it to prime.
If it STILL does not start then you need to crack open the 1st fuel injection nut and make sure fuel is coming out, some air might be trapped. Just crack it enough to be sure fuel comes out then tighten it. Complete the same procedure for each of the injectors.
If it still does not start, then probably don't have a fuel problem.
Hint - in the future, when you change fuel filters, be sure to pour the diesel
from the old filter into the new filter, being sure to leave the grit behind. This will speed up or eliminate priming.