BD Diesel Positive Air Shutdown - Ford 2020 F-Series SuperDuty 6.7LLike a fire extinguisher in your house, or an earthquake kit, it's always better to be prepared. Although rare, Diesel Engine Runaway is caused when external hydrocarbons are drawn into the engine and can cause over speeding and catastrophic engine failure. Life, limb and your vehicle are put in jeopardy. BD Diesel Performance has you covered should the worst happen with our Electronic Positive Air Shutdown (E PAS) units by cutting the intake air