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Is there anything else you do after that ?? Or do you guys just swap out the filters and that's it..?
Yes... most important step is to drink a beer upon completion!!!! This is one step they don't list on the instruction sheet!!!
I bet the largew HFCM filter cap is not seated properly... just unscrew, check filter, cap and O-ring (lube the O-ring with fresh oil - not diesel fuel) and replace... just tighten until the plastic cap is fully seated and you can't tighten it any more.