Hello I have a 1983 280zx non turbo that hasn't been ran in 4 years. Just put a new fuel pump on it and changed the oil, plugs and caps. The only issue was that it would start before we put the fuel pump on with starter fluid into the intake but now when we first hooked the fuel pump to it, it wouldnt start at all. We noticed that fuel was overfilling cylinders 5 and 4. The car will not start with the plugs in these cylinders but will run with only those two out. Im not sure if it would be caused by a sensor or even a fuel injector sticking open or even too much fuel coming from the fuel pump. Any help would be appreciated.

 

Im only guess, Stuck injectors.
1. fuel pump gauge
With these cars if you cant see whats going on, your in the dark.

Do injectors all click the same.
Are you getting signal to those 2 injectors ...Noid Light
4 years without running, many ,many things to check.
They are a challenge when they run everyday !
Guessing fouled fuel in those 2 injector, all are gunked up, but those 2 gave up the ghost............