Well now a few days ago we got our first cold night below 20 deg. In the morning went to the mule turned on the system waited for all lights and started the Duramax. It came up to idel and stalled... now it will not start. I process of changing our Fule filter.. the DM has 90k all towing miles, this will be its second fuel filter. Using the Napa 3960XE filter, seems a bit hard to get the thing to seal.. any tips?

 

I use either WIX or Fleetguard filters, as for sealing as long as you have the o-rings in place, and you snug the filter up good to the housing you should be set

You should change your fuel filter every 10k miles at least