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89 740GL won't start 700 1989

Sons vehicle not "driven" since Jan. except to move to clear driveway. When last started in 3rd week of March door was left ajar and battery drained. Charged batt. and veh started right up. Ran for 1-2 min. then stalled. Charger back on and restarted, ran for few seconds. Fully charged battery and tried restarting to no avail. Getting spark as engine fires when gas introduced through sparkplug holes and also when starting fluid introduced through air duct. Main fuel pump runs when fuel pump relay terminals are jumped (key off) and fuel is delivered to fuel rail (pulled fuel return line to determine this). Main fuel pump does not deliver fuel to front with fuel pump relay in place (key on or off) Replaced fuel pump relay assuming problem there with no change. Engine wants to run but does not seem to be getting fuel. (no gas smell at exhaust on cranking)Injectors must have been working properly when it first started until residual fuel was used. Any help would be much appreciated






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