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This EXACT same thing happen on my 87 740 turned out to be the in tank hose that connects the in-tank fuel pump to the metal fuel line there is a piece that is a rubber hose and that broke and after the fuel would get underneath that it would suck in air. you can fix this without removing the tank and there is an acess door behind the rear seats.
If by adding fuel to the car it will start then i'd very much suspect this hose.
You can also remove the fuel line off of the fuel rail and in mine the fuel came out in spurts and not very much while cranking.
Ps: i ran without the in tank pump for years till i fixed it and it made no dif.
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