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Also, I wouldn't go back to that mechanic. He obviously isn't a diesel mechanic, between the TMs and reading through the info on here you should be able to learn how to fix any issues. Google "Cummins PT pump" to learn about your injection system.

They use a rocker arm similar to how the intake or exhaust valves work. It's all in the TMs

The injectors are not computer fired. It's a completely mechanical diesel engine, very old technology. Make less assumptions and listen to others, you'll learn lots and have fun.

You said that it started again after pressurizing the tank, the pump is probably ok just an air leak somewhere. How do you know the fuel lines are good? Just because you don't see a leak doesn't mean they are fine. Air leaks in while they are under vacuum, fuel doesn't always leak out.

There is one pump in the system, the high pressure injection pump aka PT pump. No other pump. Sounds like you have an air leak somewhere between the PT pump and the tank. 30 year old fuel lines are probably due to be replaced.