Like many, my aux tank sat empty for many years and I wanted it back in service. I installed a spin on fuel/water separator/filter in the fuel line just upstream of the UFO fuel filter. Approximately 6 tanks of fuel and a dozen fuel filters later, there is some sort of green substance that won’t go away in the fuel. I know it can’t be algae, but it’s something like that. I just poured Starbrite fuel enzyme in there, and it seems to be working because I’m going through even more fuel filters and now the fuel lines are clogged. Has anyone gone through this process? I’m going to replace the one-way check valves at the fuel tank to see if that’s where the clog is. Anyone who has experience with this, please advise.