How to Use Diesel Fuel to Clean an Engine


1. Open the hood. Spread a large plastic tarp under the vehicle so the diesel fuel does not get on the pavement or ground. An aluminum pan can also be used as long as it is big enough to collect the fuel that will run off of the engine.
2. Turn the car on long enough to mildly warm the engine. The Auto Media website says a warm engine will soften the grease and buildup, making it easier to remove.
3. Cover the intake filter, distributor and wire plugs around the distributor with plastic bags. The Auto Education website recommends securing the plastic bags with rubber bands to protect the parts while the engine is being cleaned.
4. Slowly pour a small amount of diesel fuel onto the top of the engine. When the fuel has set on the engine for a few minutes, use a brush to loosen the buildup and grease. Paper towels can then be used to remove the grease and buildup from the engine.
5. Pour some diesel fuel on a towel, then use it to clean the sides and bottom of the engine without spilling large amounts of diesel fuel on the ground.
6. Spray the engine with a water hose to remove the diesel fuel. Only use water to clean the engine if the runoff can be contained correctly. Diesel fuel is not environmentally friendly, so don't let the runoff go onto grass or other natural areas.
7. Remove the plastic bags from around the engine. Shut the hood. Be sure to correctly dispose of the plastic tarp or aluminum tray that was used to contain the diesel fuel.