
Originally Posted by
Ichiban
The voltage at the pump should be battery voltage while the engine is running, and 0 with it not. I have a feeling that if you actually did see 5 volts with the engine off, that's what fried the pump, 5 volts didn't have enough go to cycle the solenoid, but likely baked the solenoid windings.
The OE pump is made by Mitsubishi. It has 2 electrical terminals, and 2 fuel lines.
The fuel cut solenoid functions differently depending on year. Early ones use oil pressure sensor signal to tell the solenoid to energize the pump. Later ones use ignition pulses to determine that the engine is running, and energize the pump.
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