Not many, but when I changed my last one it looked like it had "Asphaltines" in it. Hoot turned me on to that one. It was like unrefined oil, sludge, not stuff growing in the tank. Maybe there was still a bunch of crap in the tank and the new filter is semi clogged again. We'll see. Truck is much more responsive in #2. I remember when #3 would make my head spin.
From what I've heard, biocide is very abrasive to the fuel system and can cause some real problems. I've seen this crop up in the marine industry but who know? Ya, I run power service additive in my fuel....I think thats the name of it . Hoot, your a friggin fruit cake anyway, Mr. propane/Juice. Next for you Nitro....
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