Algea, acid, and sludge; all formed by sitting diesel and the condensation of a partially full tank. If the coach has been parked for a long time , draining and flushing might save you agony and money on filters if u do it. I have never had a fuel problem, but some have. I change primary and secondary filters once a year, need it or not, and add algecide if the bus is going to sit for a couple of months, but that doesn't happen often. Someone who has experienced a problem could probably give u more insight on how to go about cleaning out a tank.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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