I have an 1991 isuzu amigo that is not getting any fuel to the injectors. I spent the last weekend dropping the tank and pulling the fuel pump and testing it. The pump is ok. I also tested the wiring to the pump, it was good. I have changed the ignition switch, installed a new fuel pump relay (it was bad), new fuel filter. I drove it to work yesterday and to the doctors it ran fine. Went out today to go to wark, no gas getting to the injectors. Any ideals?