All fuel tanks since 1997 are a polymer base. Plastic dose not rust. I am guessing fuel. If you see a tanker emptying the fuel at a store do not fill up there for at least 15 minutes, after he is done. This will allow the trash in the tanks to settle down to the bottom.
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Frank and Janet Henn
2008 CrossRoads CF32Bl pushing a 2007 Dodge 2500
Traveling with Hoover, Rainbow and Sunshine
The wonder Schnauzers
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