2001 Mercury Sable Engine Started Knocking 2 Per Sec Immediately After

2001 MERCURY SABLE
199,000 MILES
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Engine started knocking, 2 per sec , immediately after changing fuel pump. did not knock before. Any ideas ?
Dec 8, 2012 at 1:53 PM
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ASEMASTER6371
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we cannot hear it.

did it have any noise before?? check the oil??? did you have anyone listen to it??

Roy
Dec 8, 2012 at 3:47 PM
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