Do you have a vacuum gauge on your filters? If not, I would install one.
Are your primary filters set up so only one is selected at a time? Mine are and when I changed both the one that is used all the time was dirty and the other appeared completely clean.
What primary filtration does your Cummins call for? Mine are common rail so they have a 2 micron secondary filter and they call for 10 micron primary filters. You engine isn't a common rail system so is not as sensitive to fuel contamination. If Cummins calls for 30 micron primary I would do that.
Finally, how old are the filters that you pulled out?
|