Sorry Dk35vince, I called the dealer and they confirmed it is water in the fuel. They told me to unscrew the sensor at the bottom of the separator & drain the water out. All is well now. I do plan on putting a extra seperator with a clear bowl on it so I can see what is really going on. It shouldn't be a needed once I get my 30 gallon reefer tank mounted either in an old motorcycle trailer that I have or on a skid to put in the back of my F350. I will put a filter & separator on it as well just to be on the safe side.To me it looks like it could be low coolant level in the reservoir tank.