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I started adding DEF and realized the jug was contaminated with biocide meant for the diesel tank. I haven’t started the truck and assume I need to have the truck towed to the dealer and have the DEF tank flushed??? Any ideas? How bad is this mess-up?
 

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No.....get a siphon pump and pump the tank.then add fresh DEF....and siphon it out.....and then refill with mroe fresh...might not cause a problem

get a pump like this at wal mart of harbor freight
 

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BBBRRRRRTTTTT
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Just drop the tank, dump it out. Put in fresh def, shake vigorously, dump and reinstall and fill.
 

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I would drop the tank personally. A siphon is going to leave a lot in there. Drop, dump, rinse a couple times with distilled water (DEF is mostly water) and reinstall.
 

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Ford workshop DVD says to drain the tank, siphon, into a container and dispose of it. Add fresh DEF to tank.

The procedure the dealer uses might be different since you added a pertoleum product to the tank.
 
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