Looking for some advice on what i suspect is algae. A few tanks back in the tdi cabby, it sat for quite some time while i moved from place to place for work and it only saw light driving, that tank of fuel spanned two states 4 locations and 2.5yrs! Anyway i finally get a chance to start enjoying this fall and i have had what seemed like a starvation issue after driving a bit. So i changed filter and installed a prefilter with a clear case so i could see what the story is. It once had a rusty tank when it was a gasser but i did the por15 on it and it should be good. Initially i thought the por15 did me wrong because i caught in the clear filter what looked like rust colored chunks odd shaped for rust but i figured new tank was in the future. I took the filter apart and found they are soft chunks almost like muddy playdoe i can take them swirl them between my fingers and they become a thick viscous liquid again. I now think that it is an algae but having gone through 3 tanks now of cough cough red fuel from my favorite local supplier i am still collecting these chunks. Is there an additive to kill them off? Am i wrong about it being algae? or is best bet to drain and clean tank and start fresh? Also what should i do to prevent this when it goes into hibernation shortly? thanks in advance for any ideas!