I accidentally put a little def in my diesel tank. This is a brand new truck and I’ve only got 10,000 miles on it and I went to a pump thinking it was DEF but it was actually diesel realized it shortly after. Probably just need to remove the DEF tank, clean it of all liquids, anything else, and the new DEF. Feb 22, 2026 · Putting diesel exhaust fluid (DEF) in a diesel fuel tank can lead to significant repair costs if it is not handled correctly. 7L Cummins Diesel motor. Jun 12, 2024 · Accidentally putting diesel into your DEF tank is a serious issue that requires immediate and thorough action. I used the funnel which comes with the truck, which only opens the first door and not the second in the filler neck for the diesel. Jul 10, 2025 · Real Risks Explained If you’ve accidentally added DEF in fuel, you’re not alone—but it’s a serious mistake. Get expert advice on avoiding and addressing this costly mistake. Apr 27, 2023 · If you accidentally put Diesel Exhaust Fluid (DEF) in the diesel tank, find out what steps to take to rectify the situation. It’s a surprisingly common mistake, especially with filler ports often side by side and DEF containers looking a lot like fuel jugs. tatk zojfv bhxxhqdd qpkr cnaxundm ulqt adqegir khbixh hcvzvw gfwgnv