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My boss has a 2005 Newell with a Detroit diesel. While driving from Ohio to fla the Motor coach started Blowing a white smoke with a blue tinge. It started losing power on the hills. Took me 50 minutes to go 9 miles. Called a roadside mechanic out He looked at the plastic housing. The filter is located in and it was totally full to the top of fuel. He said the fuel filter was clogged replaced fuel filter, made it to Sarasota, Florida, and fuel filter housing was completely full again. My boss put fuel additive in prior to me, leaving prior to me leaving and I also fueled up at our shop which Leiden puts fuel additive in their fuel to keep it from gelling. Would that have caused the fuel filter to get plugged up.

Is the filter turning black? I would not think any additive would cause this, gelling fuel could but it’s got to be pretty darn cold for fuel to gel up. I would say you most likely have some sort of growth in the tank. I like to run BioBor additive that kills the growth in the tank.