Where do you get high quality filtered diesel? A high volume retailer like a truck stop! Unless you can see a big filter on the side of the pump where the hose comes out it is more than likely to be insufficiently filtered, allowing the possibility of getting contamination such as dirt, water and sludge into your fuel system and potentially plugging your fuel filter. The small fuel filter on your vehicle filters between 2 to 10 microns – so the fuel that you buy should be filtered to at least 10 microns or less. There are truck stops near the port and highways, such as in the Sodo. Auto part stores sell Diesel fuel additives, you want one that says Antigel or cold weather additive. I like the Stanadyne or PowerService brands