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hello i change out my def tank filter this pat wkn in now i cant hear the pump when i turn the truck off ..my truck is a 2016 lonestar with a cummins isx cm2350

Sometimes it doesn’t do the purge cycle if the truck hasn’t run long enough to start the process of priming the lines.

seem to be working now so it seam like what u said about it needing to purge was right