cruznt00ns

I have a 1976 nissan 280z And I cant get it to start i replaced the injectors ,fuel pump ,fuel filter, spark plugs and cables the only way acan get it to runn for about 30 seconds is if i put fuel directly into the intake but my fuel pump does not get any current and i connected straight to the battery but it wont keep the car running i dont have any current to the distribuitor and i was thinking that it might be the transistor ign every fuse has been checked and all of the are fine i cant keep on guessing i think that i checked every possible cable and fuse.