A customer accidentally put a gallon of DEF into his diesel fuel tank… and after knowing the mistake he made, had to drive it 80 miles back home. The result? A completely destroyed fuel system and a $15,000 repair bill. In this video, we walk you through what happens when DEF gets into the fuel system, why it’s so catastrophic, and how we replaced everything to get this truck back on the road. From diagnosing the damage to flushing and rebuilding the entire system, we show the full process and e