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eec relay may be stuck,,sugest tapping on it to help verify the problem. If there is a relay my guess would be that it has failed. They are often under the hood but I'm not familiar with the location in a Ford pickup. The foel pump relay might be bad

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โˆ™ 2005-11-27 18:13:48
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Q: What causes the fuel pump to run constantly when the ignition switch is turned off on a 1990 Ford F150 pickup?
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