How hard is it to replace oil pump 1997 gmc p/u sierra 1500 350 engine just tuned truck oil pressure fine drops when idleing below normal

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you may try changing the sender first before the time to change the oil pump.
level of skill to change the oil pump is not high. time wise it requires either
pulling the motor or raising the engine up in the cradle and droppin the oil
pan . to answer your question directlly bout 9 to 12 hours hard
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