OC_DMAX, you are 100% correct. As saturated as this filter, it has channeled long ago and the pump and injectors are on their way to an early demise.
This filter is certainly one of the worst I have seen for a Duramax. Why someone would want to share this level of neglect is beyond me..??
I don't believe there is a bypass on our DMAX filters. At least not on the three I have cut open.
As George mentioned above, channeling occurs whenever a filter is allowed to get clogged beyond the medium’s particle-holding capacity, and there is a sufficient pressure differential across the media to take the filter to the breaking point. Eventually, somewhere, something "gives", and a hole opens up, allowing the the fuel to pass unfiltered.
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