Well wether the pump is priming it doesn't necessarily mean its getting to the engine. If the filter is clogged? If there is a bent line? Which is way out of this world. One thing to try is hold the fuel rail like 3 inches away from the intake manifold and prime it see if any fuel comes out. Are you sure its a fuel related problem? Cuz if you have shit for compression the car wont start, if you dont have the a/f fuel proper mixture obviously. Ummm a lot of different factors meng. The way to go about diagnosing something car related is decide is it electrical? mechanical? or hydraulic? Then down size from there. lemme know what you find