What to Do If You Put Petrol in a Diesel Car

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Putting petrol in diesel car is a common mistake that can cause serious damage to your vehicle. If this happens to you, knowing the right steps to take immediately can save you from costly repairs and long downtime. This guide explains what happens when petrol enters a diesel engine and what actions you should take to protect your car.

!Close-up view of a diesel fuel nozzle inserted into a car's fuel tank

Why Putting Petrol in Diesel Car Is a Problem

Diesel engines rely on the lubricating properties of diesel fuel to keep their fuel system components working smoothly. Petrol, on the other hand, is more volatile and lacks these lubricants. When petrol enters a diesel engine, it can cause:

• Damage to fuel injectors and fuel pump due to lack of lubrication

• Engine knocking and misfires because petrol ignites differently than diesel

• Clogged fuel filters as petrol contaminates diesel residues

• Potential engine failure if the car is driven with the wrong fuel

  
  

Even a small amount of petrol in a diesel tank can cause these issues, so quick action is essential.

How to Recognize Petrol in a Diesel Car

If you accidentally put petrol in your diesel car, you might notice some warning signs before starting or while driving:

• The engine struggles to start or won’t start at all

• The engine runs roughly or stalls soon after starting

• Warning lights on the dashboard related to the engine or fuel system

• Unusual noises such as knocking or pinging sounds

  
  

If you suspect you have put petrol in your diesel car, do not start the engine. Starting the engine can circulate the petrol through the fuel system and cause more damage.

Immediate Steps to Take After Putting Petrol in a Diesel Car

1. Do not start the engine

   Avoid turning on the ignition or starting the car. This prevents petrol from reaching sensitive engine parts.

   
   

2. Call our professional fuel removal service

   Contact our specialist team experienced in handling wrong fuel situations. Wrong Fuel Team can be reached at 07917 952153 and offers fast, reliable assistance.

   
   

What Professionals Do to Fix Petrol in a Diesel Car

When experts handle petrol contamination in a diesel engine, they typically:

• Drain the entire fuel tank to remove all petrol and diesel mix

• Flush the fuel lines and replace fuel filters to clear any residue

• Inspect and test the fuel pump and injectors for damage

• Refill the tank with clean diesel fuel

• Perform engine diagnostics to ensure no lasting damage

  
  

This process usually takes a few hours but can save you thousands in repairs.

How to Avoid Putting Petrol in a Diesel Car

Preventing this mistake is better than fixing it. Here are some practical tips:

• Always check the fuel type label on your car’s fuel cap before refueling

• Pay attention to the pump nozzle color and shape; diesel nozzles are usually larger

• Avoid distractions at the pump and double-check before inserting the nozzle

• If you rent or borrow a car, confirm the fuel type with the owner or rental company

• Use apps or services that remind you of your car’s fuel type

  
  

What Happens If You Drive After Putting Petrol in a Diesel Car

Driving with petrol in a diesel engine can cause:

• Rapid wear and tear on the fuel pump and injectors

• Engine misfires and loss of power

• Increased risk of engine seizure or complete failure

  
  

If you realize the mistake after driving, stop immediately and seek professional help. The longer you drive, the more damage you risk.

Cost Implications of Putting Petrol in a Diesel Car

Repair costs vary depending on how much petrol was added and how long the engine ran. Typical expenses include:

• Fuel draining and flushing: £100–£300

• Fuel pump replacement: £400–£1,000

• Injector repairs or replacement: £500–£1,200

• Engine repairs in severe cases: £1,500+

  
  

Acting quickly reduces these costs significantly.

When to Call Wrong Fuel Team

If you find yourself in this situation, Wrong Fuel Team offers expert help. We provide:

• 24/7 emergency response

• Professional fuel draining and cleaning

• Advice on next steps and repairs

  
  

You can reach them at 07917 952153 or visit our website wrongfuelteam.co.uk for more information.