What should be done if diesel fuel is accidentally added to the car?

If diesel fuel is mistakenly added to a car's fuel tank, it will have negative effects on the vehicle. Diesel and gasoline have significant chemical differences and should not be mixed.

Adding diesel fuel to the fuel system of a gasoline car can lead to the following problems:

1. Difficult engine startup: Diesel and gasoline have different ignition methods and ignition temperatures, causing difficulties in starting a gasoline engine.

2. Engine misfire or stalling: Diesel cannot be ignited in a gasoline engine, so if diesel enters the cylinders of a gasoline engine, it can cause misfires or engine stalling.

3. Pollution of emission systems: Diesel can damage the emission system of a gasoline car, leading to failure in passing emission tests.

4. If diesel has been accidentally added to the fuel tank of a gasoline car, the vehicle should be immediately stopped and roadside assistance should be contacted. Do not attempt to restart the vehicle before repair to avoid further damage.

To repair this issue, the following steps are typically taken:

1. Draining the fuel tank: The mixed diesel and gasoline need to be drained from the tank, and any residues should be cleaned out.

2. Replacing the fuel filter: Due to the different chemical properties of diesel and gasoline, the fuel filter of the car must be replaced to prevent any further damage from diesel residue in the fuel system.

3. Cleaning the fuel system: The fuel system needs to be cleaned to ensure there are no impurities or diesel residues. This can be done using professional equipment or by adding fuel system cleaner

4. Replacing spark plugs: If the engine has been started and the car has been driven for a period of time, diesel may have entered the cylinders of the gasoline engine and damaged the spark plugs. Therefore, the spark plugs should be inspected and replaced if needed.

5. Engine adjustment: Lastly, the engine needs to be adjusted to ensure proper operation without any abnormal noises or vibrations.

It is important to note that adding diesel to a gasoline car's fuel system can cause severe damage, so attempting self-repair is not recommended. The proper course of action is to immediately stop using the vehicle and contact roadside assistance or towing service to transport the vehicle to a professional repair facility.