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Why doesn't polarity matter for fuel injectors? If they are essentially a solenoid, then it seems it would matter; swapping polarity would change the direction the electromagnet pulls or pushes.

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  • In the case of a solenoid that's picky about polarity, there are likely two magnets that pull in opposite directions. I believe that injectors use a magnet and a spring, but I could be mistaken.
    – 3Dave
    Jan 13, 2020 at 22:28

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Like normal magnets, electro magnets can only attract (pull) metallic objects, so the injector coil could not repel the solenoid valve.

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