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I added a 37 gallon tank to my truck and when I bought the tank new I welded in a bung for a fitting to drain into the main tank. It has a small valve that I open and it refills the tank as I drive. Love it for long drives!
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2008 Silverado 3500HD 4x4 SRW Duramax Allison trans
2014 Cougar 327 RES "Campy"
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