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Q: fuel pump keeps running but won't turn over the engine. on 1994 Ford Explorer

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Checked the presure 40lbs,changed the regulator, relay works. What tells the fuel pump to shut off? It's only suppose to run a few seconds than shut off but keeps running sometimes for a few minutes and engine won't start.
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the computer turns it on for 2 seconds to prime the system. it should not run again till the motor cranks and starts.
does it have spark??

Roy
Yes it has a spark. Is the computer the only thing that tells the pump to run 2 sec. or is there something else? When it's cold it runs the pump for 5to10 min. then it might shut off then the car will start.
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