806 man Posted September 24, 2022 Share Posted September 24, 2022 Been fighting this for a year. Running Cat 3406E in 4 trucks. Fleet-gard Filters last 1700 -2000 miles. Local shop guy says problem is the fuel has less sulfur (EPA) so an addictive is added for lubrication this additive is getting cooked in the head and creating fine black particles which plug up the filter ( we have opened filters and found this ) the guy says the cure is don't shut off engine till it has cooled more so the fuel won't be cooked in the head which we have been doing by leaving trucks running when fueling up each day. I have 2 fuel tanks a 15,000 for off road (no issues) and 6,000 on road which is where my issue is. Any knowledge of this issue or suggestions. Quote Link to comment Share on other sites More sharing options...
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