If Dave’s theory about the injectors was right, it was going to be relatively trivial to fix Peregrine’s engine. If his theory was wrong, then it was likely to be very expensive as the next likely thing to have failed was a fuel pump. So our fingers were crossed. Apparently that Perkins engine is known for being finicky on the high pressure side. You can “crack” the fuel line at each injector to let fuel escape. Then you crack it with full throttle to get all the air out of the lines. Then tighten them back up after making a big mess. Sure enough, once they bled the high side injectors the engine started to purr. Whoo hoo!