If the engine is being fueled by engine lubricating oil, then it would be best to go for the air. You need to choke the engine out. If your vehicle has a CO2 fire extinguisher this can work well. Spray the CO2 directly into the intake until it shuts down.
This works because the CO2 replaces the oxygen and with no air, the engine shuts off. When this happened to me personally, I grabbed a fender cover and some rags and stuffed them into the intake, and it shut down. You can remove the intake hose and cover it with a book or something. But be careful it will be moving a lot of air. It will need to be sturdy. This is no joke. The amount of air moving into the intake at a high RPM will be very dangerous. Trying to stuff rags and things into the intake will be very dangerous.
You could lose your hand. The engine could just suck whatever you put in there right up. It is better to go for a hard. If you are running a manual transmission and you are in the cab you have another option.
As soon as it starts to run away you can press the brake pedal and put the transmission in a high gear and release the clutch while still holding the brake. This will provide enough torque to shut the engine down. You must take caution when attempting this method because the truck will move even with the brake depressed. Another option is to plug up the exhaust. I have not ever used or seen this method used but it is possible in theory.
If you are in a situation where the run-away is being caused by over-fueling of the diesel fuel I would go after the fuel. There are quite a few ways to do this. One is to take the fuel filter off. This will stop the engine with the best and safest results.
Slowly let off the clutch and let it grab the flywheel. The engine should stumble and die. Even after a small or mild runaway condition. It will just start it all over again. Call a tow truck and, if need be, push the vehicle out of the way of traffic.
Now you know what a runaway diesel is, what causes it, and how to stop it. Of course there are too many factors at play to cover everything. And every situation is unique. But knowledge is power, and knowing how to possibly prevent and deal with a runaway diesel can save lives, and possibly your pride and joy.
This is also my second article, so feel free to constructively criticize it. And your thoughts are always welcomed. This content was originally posted by a Car Throttle user on our Community platform and was not commissioned or created by the CT editorial team. Please confirm you agree to the use of tracking cookies as outlined in the Cookies Policy.
Sign in or register. Then the quickest method to shut the engine off is to use the CO2 fire extinguisher you normally carry in your car. Grab it, pop the hood and spray right near the intake. It helps if you know which one that is before. If not, spray everywhere.
The CO2 will replace the air needed to burn the fuel which should stop the engine. This method also works if flammable gasses surrounding the car have started the runaway. If wind blows from behind and covers the whole car, you should better stay away and call the authorities. If you covered the intake snuggly but the engine still runs, it means there are leaks along the rest of the intake piping and the engine is able to suck from there.
With a manual transmission, you can put it in the highest gear, apply the brakes and release the clutch. This should offer more resistance than the engine can sustain and choke it. If you tried the first method, by putting it in neutral and pulling over, the maneuver can still be performed in the same way - after safely coming to a stop, hold the brakes firmly, engage the highest gear and dump the clutch.
The car might jerk forward so watch out. What to do after you stopped a runaway diesel? A runaway diesel is a very dangerous situation due to the immense forces on the engine itself. Because of the way a diesel engine operates, simply turning the key off to kill the ignition has zero effect on stopping a runaway. A diesel engine only needs fuel and air to create combustion, and the more fuel is delivered, the faster the engine revs. So, in order to stop the engine, you must either cut off the air supply, or the fuel supply.
Since it can be unclear where the fuel is coming from, it's often easier to cut off the air supply. Blocking off the intake can slow down the RPM and stop the engine before things get really out of hand. Some people have used rags, t-shirts or even a fire extinguisher to smother the engine, but again, do so at your own risk.
Vehicles equipped with manual transmissions can sometimes put the truck into a high gear such as 5th or 6th, and using the brakes and letting off the clutch to stall the engine.
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