how much should it cost to replace the oil pump?

2003 CHEVROLET VENTURE
120,000 MILES
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BOB1478
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engine started to knock loud when driving like there was no oil in it. I checked the oil and it was clean and full. Just had it changed about 10 days ago
Feb 19, 2012 at 9:37 PM
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RASMATAZ
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Could be the oil pump or engine bearings-get the oil pressure checked-
Feb 19, 2012 at 9:40 PM