Why would a 1988 Chevy silverado die on road replaced fuel pump and still no start but it runs with starting fluid thens dies with out the starting fluid?

Answer 1

Check fuel injectors at the harness plug at the injector, with key ON, engine off. There will be 2 wires at the injector plug, 1 while using a ohm and volt meter, and 1 wire should have battery voltage with key on at all times, the other wire use a test light and back probe while someone else is cranking the motor the test light should blink on and off, while cranking. If the test light in not blinking during the cranking you most likely need an ECM Module. Your fuel injectors gets there ground pulse from the ECM so if you have fuel pressure, ignition, and spark and 12 volts at the injector but no ground replace the ECM. Hope this helps!!