I have recently finished an engine rebuild on my 1982 Fiat 124 Spider. Things seem to be in decent shape except it won't start. It fires nicely and sounds as if it would love to run for me, but that only lasts a few seconds and it dies. It would appear to be in the fuel system but I am not very knowledgable about that. I believe that it is geting enough fuel to the injectors. There is a decent stream if I keep the fuel pump engaged. How do I check eveything out and narrow the problem.