[cobred]

If your F.I. setup uses 8 seperate injectos, 1 per cyl. they should have a 2 wire plug at each injector. Normally with the key on one wire should have 12volts, the other wire gets a ground pulse from the computor while cranking to fire the injector. Worth a check. Use a test light but dont jam the probe into the terminals or they will spread and not make a tight connection.
You also mentioned fuel pressure, you should have pressure with the key on and the pump should run for a few seconds and hold pressure, but should also maintain the pressure while cranking. This is how most o.e.m. systems work, I would think yours is the same.