Jeff, yes it is a diesel additive. I don't know how much fuel is in the tank. It's a 100 gal tank and I had about 180 nm on it when the trouble showed up but the tank hadn't been topped up since last july just before my trip to the 43. I would guess about 20-30 gallons were left. I put the remainder of the bottle in which was about 4oz, then before I took it out again I stopped at the filling station and my buddy put 10 gallons in just to be on the safe side. I don't know why it happened on this trip and not on either of the two trips just two weeks before. Maybe the fuel level got low enough and the weather was rough enough to give the tank a good sloshing around and stir it up. This last trip was rougher than the previous three so I'm confident that nothing just settled out. I had this same problem when I first bought the boat and used the same stuff but it probably wasn't as strong of a shock dose last time and I remember changing my filter a few times. I usually use the recommended maintenance dose but probably forgot the last fillup or two.
Brian
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