Crank no start. has spark and air and fuel seems weak

Hello, all my name is: htseat2000
I have a: 3000gt crank but no start. I bought this 1995 Mitsubishi 3000gt with 60k miles for 1000 bucks. previous owner overheated motor to point where it needed new motor. my son and I replaced motor with a used one with 22k miles. installed it. cranks but no start. it is getting spark and air. will backfire if i spray starting fluid but no run. if I turn ignition to on, fuel pump will not turn on, but hear the relay kick on, but then when attempt to start for a couple seconds fuel pump will be run for a second and stop. i am at a loss. I am a gm man, but my son wanted this car as a project.

The pump does not run at key on. It only runs when the crank sensor sees movement.

1 Like

Then wonder why it won’t start.

Did you check the timing on the motor when you installed it?

It is dead on the timing marks

Have you serviced your ecm to make sure it’s not damaged? Also, did you double check all the wires are connected? I’ve forgotten to check all my connections once when changing a clutch. Check around the starter.