[Fulltiming]

Definitely algae. After you get it running, you need to add algaecide. I have used Biobor Diesel Biocide with good results. Have a good supply of secondary fuel filters on hand when you use it. When I got a tank of bad fuel, I had to have my fuel 'polished' to remove the algae. Fortunately, I was in Newport Beach, CA at the time and there were several companies with mobile rigs that they used to clean up the fuel in boats that were available to come to my site. I still carry extra secondary fuel filters in the same bay as I store the biocide just in case.