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Re: Diesel Fuel in DEF Tank, 2018 Hino 258
Posted to HD/Fleet Forum on 10/22/2020 5 Replies

There is usually a drain plug on the bottom of the DEF tank. Take it out and drain all that will come out. Then put the plug back in.

Flush the tank with water and a little simple green. Use an air hose with a nozzle to agitate the mix then flush clean with ... Login to read more.

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