1990 Ford F150 Fuel Injector

Hello .. thanks for the donation .. much appreciated All the injectors recieve power from and ground from ECA(electronic control assembly) basically it's the cars computer .. for injectors to be staying energized @ key off the wiring through the ECA would have to be bad .. power is supplied to injectors @ key ON ..through the ECA and a seperate pulsed ground is supplied to injectors for enegizing @ firing time (ground on to inject fuel ground off to stop injection)are you sure it's an injector draining battery ? let me know .. During system operation, ECA transmits electrical reference signals to engine sensors and analyzes return signals to determine engine operating conditions. If a sensor or actuator fails, ECA initiates an alternative strategy, allowing vehicle to maintain driveability. This strategy is called Failure Mode Effects Management (FMEM). The CHECK ENGINE light will illuminate and remain on whenever FMEM is in operation. The ECA, overriding failed component with a FMEM substitute operation value, continues to monitor failed sensor. Should signals from faulty sensor return to within operational limits, ECA will cancel FMEM control and resume control based on sensor signals

FUEL INJECTORS Each cylinder has a solenoid-operated injector which sprays fuel toward back of each intake valve. ECA controls pulse width or time each injector is energized. Fuel injectors meter and atomize fuel delivered to engine. Each injector receives battery voltage through ignition switch circuit. The ECA controlled ground circuit completes circuit and energize injector. Injector bodies consist of solenoid-actuated pintle and needle valve assembly. Injector flow orifice is fixed and fuel pressure at injector tip is constant. Atomizing spray is obtained by shape of pintle.