Petrol in Diesel: What Happens & How to Fix

Introduction

Putting petrol into a diesel engine is one of the most dangerous things you can do to your vehicle. The consequences are immediate and devastating.

The Chemistry Behind Petrol in Diesel

Diesel engines require diesel fuel because it has a higher viscosity, which allows for better atomization and combustion. Petrol, on the other hand, is designed for gasoline engines and does not have the right properties to ignite properly in a diesel engine. When petrol enters a diesel engine, several things happen:

1. Initial Ignition: The spark plug ignites the mixture of air and petrol, leading to an explosion that can cause severe damage to the engine.
2. Damage to Engine Components: The high pressure and temperature generated by the explosion can warp pistons, bend valves, and destroy fuel injectors.
3. Fuel System Damage: The diesel fuel in the system is also affected; it may become contaminated with petrol, leading to further issues like clogged filters and damaged fuel pumps.

Timeline of Potential Damage

The damage caused by putting petrol in a diesel engine can occur almost immediately or over time depending on various factors such as the amount of petrol used, the vehicle's condition, and environmental conditions. Here’s what you might expect:

• Immediate Effects: The first sign is often an engine that won’t start properly. You may hear knocking sounds from the cylinders.
• Short-Term Damage: Over time, the damage can escalate to more severe issues like a blown head gasket, cracked pistons, or even complete engine failure if not addressed promptly.

Repair Process

To fix a diesel engine that has been misfuelled with petrol, you need to follow these steps:

1. Vehicle Collection: EEK Mechanical will dispatch a tow truck to collect the vehicle from any location (forecourt, roadside, home, car park). The vehicle is then transported to a NZIFDA-certified workshop.
2. Manufacturer-Spec Fuel System Recovery: At the workshop, manufacturer-specific procedures are followed to clean and repair the fuel system. This process cannot be done at the collection location; it must happen in a certified workshop.
3. Post-Recovery Care: After the repairs are completed, the vehicle is returned to you by EEK Mechanical’s tow truck. You can then continue with your regular maintenance schedule as usual.

What to Do Right Now

If you suspect that petrol has been put into a diesel engine, do not attempt any DIY fixes or start the engine. The first step should be to contact EEK Mechanical immediately for professional assistance. Our tow trucks are available 24/7 and can transport your vehicle safely to our certified workshops.

Conclusion

Putting petrol in a diesel car is a serious mistake that requires immediate attention from professionals. By following the steps outlined above, you can minimize further damage and ensure a safe recovery for your vehicle. Remember: Do Not Start the Engine! For more information on misfuel repair costs or to get an itemised quote, visit our <a href="/rate-card" class="text-eek-orange no-underline hover:underline">rate card</a>.