Do a Direct pressure test from the delivery line, without a "T" fitting. Post your direct pressure reading. With the T fitting between the delivery line and FD, you need 80PSI. Did you check your tank pick up screen? Get a new O-ring first, and remove the cylindrical strainer from the center of your tank. Its probably all "greened" up... Sediment, fuel component breakdown and varnishes, will clog that screen just sitting unused for 1 year, not even imagining what 3 or 4 years could bring.... Clean it or replace it. If its really gooey when it comes out, you must do a tank removal and get the tank flushed, boiled, or steamed cleaned. If you dont service the tank properly, you will have fuel problems again. Check the two large hoses from the idle control solenoid, Ive heard they do pop off if you have a back fire, or they just slip off sometimes. Dont forget the accumulator, plug the smaller return line from it to see if you can pressure up again.... Dont ever pinch the lines, they will crack and add more debris into the fuel system. If this doesnt help, get a multimeter hooked up to one of the pumps, you need a solid 13.5 volts there while running, perhaps 10.8 to 11.8 while cranking. Hows the battery? Try a hot newer one..... When checking for injection at a cracked injector line, you must lightly depress the fuel plate, approximately 1/4 inch or more, thus moving the metering plunger down enough to activate fuel dispersal. Did you use a used coil? Check your spark color, it must be whitish blue, with an audable snap. If its redish orange, your coil isnt making enough HT.