Hey there. The engine could be very tired but it does sound like a possible fuel issue. Change out the fuel filter and see if the air filter is in good repair. The nice thing about a diesel is that once you get the fuel and air the ignition is all handled by the compression which makes it simple. Also check the fuel lines for any leaks as a very very small leak can make starting difficult and running after a start not much better because it will lose the prime that is extremely important for it to run properly.
Cheers!
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