I purchased a new OEM fuel filter ($57.87 + Tax) for our Duramax from the local GM dealer here in Columbus, Ohio Saturday morning. On inspection, the filter shows evidence of surface corrosion that can be seen through the water sensor port. Will cut it open tomorrow and follow with photos. This is some of the worst metal working I have seen in a good while. It is now clear where/why we have seen the examples of severely rusted OEM filters, with some rusting through; any presence of entrained water (which will exist) will cause this filter to immediately begin corroding.
George Morrison
George Morrison