ECU failure

[KHorsman]

I have an EJ22  94 in a beach buggy. Engine coughed a few times. Once stopped it would not start. Fuel pump does not activate.   OB1 electronics.

Earthed solenoid and the fuel pump worked, still no start. ECUs are getting very rare so bought a re-conditioned one at great cost. Installed and no change. 

Checked power and earths to the ECU , all OK. Connected green plugs , and pump does not turn on. 

The supplier claims the ECU was tested and OK, but this sounds to me  like an ECU failure.

Can anyone help with any more ideas?

[jonathan909]

By "earthed solenoid" I assume you mean "grounded the coil of the fuel pump relay".  So far, so good.  From where you are, I wouldn't jump directly to "bad ECU".  Let's go back to first principles, and stop me if I get anything wrong.

The initial failure symptom was no fuel, but you know the relay and pump are good, so you changed the ECU, but that didn't solve the problem.  You're reading that as "two bad ECUs", where I read it as "ECU not the problem, because you just swapped in a known-good (according to the supplier) one".  The whole point of the ECU is that listens to a whole bunch of inputs and drives a whole bunch of outputs.  So I'd be looking at all of the inputs to see which ones need to be satisfied in order for the ECU to want to pump fuel.