What to Do If You Accidently Put Diesel in a Petrol Car in Cambridgeshire
- Misfuelled Car Fixer Cambridgeshire
- Mar 2
- 3 min read
0330 122 6640
Putting the wrong fuel in your car is a common mistake that can cause serious damage if not handled quickly. If you accidentally put diesel in a petrol car, it’s important to act fast to avoid costly repairs and breakdowns. This guide explains what steps to take immediately, how to prevent further damage, and where to get professional help in Cambridgeshire.
Accidently Put Diesel in a Petrol Car in Cambridgeshire
Diesel and petrol engines operate differently. Petrol engines rely on spark plugs to ignite a highly volatile fuel-air mixture, while diesel engines compress air to ignite a less volatile fuel. When diesel enters a petrol engine, it does not combust properly. This causes:
Engine misfires and rough running
Clogged fuel injectors and filters
Damage to spark plugs and catalytic converters
Potential engine stalling or failure
The longer diesel stays in the petrol system, the more damage it can cause. That’s why immediate action is critical.
Immediate Steps to Take After Misfuelling
If you realize you have put diesel in a petrol car, follow these steps:
Do not start the engine
Starting the engine circulates diesel through the fuel system, increasing damage risk.
Turn off the ignition
If the engine is already running, switch it off immediately.
Call for professional help
Contact a specialist like Misfuelled Car Fixer Cambridgeshire at 0330 122 6640. They have the tools and expertise to safely drain and clean your fuel system.
Avoid driving the car
Driving can push diesel deeper into the engine components, making repairs more expensive.
Inform your insurance company
Some policies cover misfuelling damage, so notify your insurer promptly.
What Professionals Do to Fix Misfuelled Cars
What to Do If You Accidently Put Diesel in a Petrol Car in Cambridgeshire? When you call a service like Misfuelled Car Fixer Cambridgeshire, we perform the following:
Drain the fuel tank completely
Removing all contaminated fuel is the first priority.
Flush the fuel lines and injectors
This clears diesel residues that could block or damage parts.
Check spark plugs and ignition system
Diesel can foul spark plugs, so these may need cleaning or replacement.
Test the engine
After cleaning, the car is tested to ensure it runs smoothly.
This process usually takes a few hours but prevents long-term damage and costly repairs.
How to Prevent Putting Diesel in a Petrol Car
Preventing misfuelling is easier than fixing it. Here are some tips:
Always check the fuel type before filling
Look for the label on the fuel pump and your car’s fuel cap.
Use different fuel stations if unsure
Some stations have clearer labeling or separate areas for diesel and petrol.
Ask for help if you’re unsure
Staff at fuel stations can assist if you’re uncertain which pump to use.
Keep a reminder note in your car
A simple sticker near the fuel cap can help avoid mistakes.
Be extra careful when driving rental or unfamiliar cars
Different models may have different fuel requirements.
What to Do If You Have Already Driven the Car
If you started the engine or drove the car after putting diesel in a petrol tank, the damage might be more serious. Here’s what to do:
Stop driving immediately
Continuing to drive can cause engine damage.
Call a recovery service
Have the car towed to a specialist workshop.
Inform the repair service about the misfuelling
This helps them prepare the right tools and parts.
Expect a thorough inspection
The mechanics will check for damage to injectors, spark plugs, and the catalytic converter.
Repairs can be costly if diesel has circulated through the engine, so acting quickly reduces expenses.
Costs and Insurance Considerations
Repair costs vary depending on how much diesel entered the system and whether the engine was started. Typical costs include:
Fuel draining and flushing: £100–£200
Fuel filter replacement: £50–£100
Spark plug replacement: £50–£150
Injector cleaning or replacement: £200–£500+
Some insurance policies cover misfuelling damage, but many do not. Check your policy details or speak with your insurer after the incident.
Why Use a Specialist in Cambridgeshire
Local specialists like Misfuelled Car Fixer Cambridgeshire understand the specific needs of drivers in the area. They offer:
Fast response times
Knowledge of local garages and parts suppliers
Expertise with a wide range of car models
Transparent pricing and reliable service
Calling 0330 122 6640 connects you to professionals who can minimize damage and get your car back on the road safely.
Signs You May Have Put Diesel in a Petrol Car
Sometimes you may not realize the mistake immediately. Watch for these warning signs:
Engine struggles to start or won’t start
Rough idling or stalling
Loss of power or hesitation during acceleration
Strong smell of diesel exhaust
Warning lights on the dashboard
If you notice any of these, stop using the car and seek help.
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