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If your fuel pump won't run when turning on ignition, but, [will run by alternate power source] then your problem is most likely in wiring from pump to ignition module. Follow leads from fuel pump and trace back towards front of vehicle. You may find a chewed or corroded wire or even a two-piece harness separated. Also make sure your vehicle doesn't have a fuel pump shut off switch. Usually located in driver side fender-well in trunk. This was a safety feature added by some car companies in the late 80's early 90's to prevent fires in event of an accident.

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Q: 1992 Plymouth Acclaim I've replaced the fuel pump relay fuel filter checked the map censor when i turn the key the pump won't engage but will with alternate power source why won't fuel pump run?
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