What to Do If You Accidentally Put Petrol in Your Diesel Car
- Misfuelled Car Fix
- Jan 14
- 4 min read
Updated: Jan 28
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National Wrong Fuel Rescue: https://www.misfuelledcarfix.co.uk
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Putting petrol in a diesel car is a common mistake that can cause serious damage if not handled quickly and correctly. If you’ve just realised you’ve filled your diesel vehicle with petrol, don’t panic. Acting fast can save you from costly repairs and get you back on the road sooner. This guide explains exactly what happens when petrol goes into a diesel engine, the risks involved, and the steps you should take immediately to minimise damage.
Why Putting Petrol in a Diesel Car Is a Problem
Diesel engines and petrol engines work differently. Diesel fuel lubricates the engine’s fuel system, while petrol acts as a solvent and can damage diesel components. When petrol enters a diesel engine, it reduces lubrication, causing metal parts to grind and wear out quickly. This can lead to:
Damage to the fuel pump and injectors
Engine misfires or failure to start
Increased wear and tear on engine components
Costly repairs or even engine replacement
Even a small amount of petrol in a diesel tank can cause problems, so it’s important to act immediately.
Signs You’ve Put Petrol in Your Diesel Car
Sometimes you might not notice the mistake right away. Here are some common signs that petrol is in your diesel tank:
Engine struggles to start or won’t start at all
Rough idling or stalling soon after starting
Loss of power or hesitation during acceleration
Warning lights on the dashboard, especially the check engine light
Unusual noises from the engine or fuel pump
If you experience any of these symptoms after refuelling, suspect petrol contamination and take action quickly.
What to Do Immediately After Putting Petrol in a Diesel Car
If you realise you’ve put petrol in your diesel car before starting the engine, do not start the vehicle. Starting the engine will circulate the petrol through the fuel system and cause more damage.
Here’s what you should do:
Do not start the engine
Keep the ignition off to prevent petrol from reaching the engine components.
Call a professional misfuelled car fixer
Contact a specialist who can drain and clean your fuel system safely. You can call 0800 999 1182 for nationwide 24/7 assistance from experts.
How Professionals Fix Petrol in Diesel Cars
Specialist misfuelled car fixers follow a thorough process to minimise damage:
Drain the contaminated fuel
We remove all petrol and diesel mixture from the tank.
Flush the fuel system
The entire fuel system, including fuel lines, filters, and injectors, is cleaned to remove petrol residues.
Check engine components
The fuel pump and injectors are inspected for damage and repaired or replaced if necessary.
Refill with clean diesel
After cleaning, the tank is refilled with fresh diesel fuel.
This process requires specialised tools and knowledge, so avoid trying to fix the problem yourself.
How Much Damage Can Petrol Cause in a Diesel Engine?
The extent of damage depends on how much petrol was added and whether the engine was started. Some examples:
Small amount, engine not started
Minimal damage if the fuel is drained quickly. Usually, a thorough flush are enough.
Small amount, engine started
Damage to fuel pump and injectors is possible. Repairs can be costly but often avoid engine replacement.
Large amount, engine started
Severe damage to fuel system and engine components. In worst cases, the engine may need to be rebuilt or replaced.
The sooner you act, the better the chances of avoiding expensive repairs.
Preventing Petrol Misfuelling in the Future
Avoiding this mistake is the best way to protect your car. Here are some tips:
Double-check the fuel pump before filling
Always confirm you are using the correct pump for your vehicle.
Look for clear labels on your car’s fuel cap
Many diesel cars have a sticker or engraving indicating the correct fuel type.
Ask for help if unsure
Petrol stations often have attendants who can assist.
Use fuel cards or apps with vehicle-specific settings
Some apps warn you if you select the wrong fuel type.
Educate all drivers of the vehicle
Make sure everyone who drives the car knows the correct fuel type.
When to Call Misfuelled Car Fixer Nationwide 24/7
If you suspect petrol in your diesel car, call aourprofessional service immediately. Misfuelled Car Fixer offers nationwide 24/7 service and can help you avoid costly damage. Our experts will:
Provide advice on what to do next
Arrange emergency fuel draining and cleaning
Help with towing if needed
You can reach us at 0800 999 1182 or visit our website misfuelledcarfix.co.uk/petrol-in-diesel for more information.
What to Expect After Your Car Is Fixed
After the fuel system is cleaned and repaired, your car should run normally. However, keep an eye on:
Engine performance
Fuel consumption
Any unusual noises or warning lights
If problems persist, return to the garage for a follow-up check. Regular maintenance and prompt attention to fuel issues will keep your diesel engine healthy.
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