Did the Komatsu mechanic do all the electrical testing first along with checking codes, cause lets face it if there is anything wrong electrically to the computer control, you don't need any of the other parts until the computer sees clean power in and ground along with quality crank sensors or cam sensor information. Injectors and computers do not run well with poor connections somewhere. Don't be surprised if you get grief over the aftermarket injectors from the Dealer mechanic. You changed a lot of fuel pressure related items and it still will not start, tells me something is being missed. He has the schematics and technical info if he knows how to use it. Everything tested needs to be recorded for the next guy that will work on it. Fuel lines blown out is good but is there a banjo bolt or screen in one that is plugged. Someone is not thinking for all the money you have thrown on it. Did he even test the computer power in and out wiring. If you installed more than the injectors aftermarket, you may not ever get it going in my opinion. Too many stories on this forum about faulty sensors that sent people down rabbit holes. You need to make a list of exactly what is what for the next guy coming on the job. Simon C