I have to hand it to you, Keep on trying!

Pull the spin on fuel filter and see if it is full. My guess is that you will need to fill it up.
then loosen all of the injector lines at the injectors. Crank the car until you see fuel at all of the injectors. Tighten them down. And cycle the GP, and see if it will start.
Must have good charged battery before cranking. Sounds like some air in the system. Have to fight it to get it out.

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83 300SD Dark Silver Dark brown inside