[crazyhorse]

Here's my 2cents worth from having put an FI engine where it never should have been (5.0 GT motor into a '74 'Stang)

In the SVX, is there a fuel check valve? One that would keep the fuel from running back to the tank? Could you try turning the key on, then letting it sit there building pressure before trying it? I'd have to agree with Hocrest on this, if the SVX drives the fuel pump differently than the XT, then you may need to set the pump up the same way.

Remember, heat expands, cold contracts. There's a slim chance that you have a wire with an internal break. Those can be MADDENING to locate.

Check all your interfaces, where new, meets old, just for peace of mind.

For the CEL you could wire it into the seat belt light, like I did with my 'Stang. That was the only idiot light I could spare. Gotta love full instrumentation.