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Old 10-28-2017, 12:00 AM   #9
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Join Date: Mar 2013
Location: Marquette michigan
Posts: 828
Re: 2004 Vortec 5.3 Oil Pressure Sending Unit?

LBJ, I believe that once you remove the sender look down inside the hole and i think there is a small screen that gets varnished/plugged up, but gm sell a new one. This screen issue can make a perfectly working sender indicate wrong because oil pressure gets blocked/plugged.
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