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Pump valve for fuel (on top of fuel filter on rd28t) until it I firm.
Using two spanners, loosen the fuel lines at the top of the injector, on the fuel lines you changed. (I would do this to all injectors so it doesn't fire)
See if you can pump valve again
Crank engine for 10 seconds or so and rest for a minute, then go again. Repeat until fuel starts dribbling at the top of injectors.
Torque injector lines, using two spanners.
Crank again, and it should soon fire.
Either idle/drive to recharge battery, or turn it off and put a 240v charger on it.
When convenient, wash off diesel around injectors, and check for leaks.