How to Fix Petrol in Diesel Car in Cambridgeshire
- Misfuelled Car Fixer Cambridgeshire
- Mar 16
- 3 min read
24/7 Line: 0330 122 6640
Putting petrol in a diesel car is a common mistake that can cause serious damage if not addressed quickly. If you find yourself in this situation in Cambridgeshire, knowing the right steps to take can save you time, money, and stress. This guide explains what happens when petrol is added to a diesel engine, how to spot the problem early, and the best ways to fix it with professional help available locally.

What Happens When Petrol Is Put in a Diesel Car
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 misfiring because petrol ignites differently than diesel
Clogged fuel filters as petrol contaminates diesel residues
Potential engine failure if the car is driven with petrol in the tank
The severity depends on how much petrol was added and whether the engine was started afterward.
How to Recognize Petrol in a Diesel Car
Early detection is key to minimizing damage. Signs that petrol has been put in a diesel car include:
The engine struggles to start or won’t start at all
Unusual knocking or rattling noises from the engine
Warning lights on the dashboard, especially related to the engine or fuel system
Poor engine performance and loss of power
Excessive smoke from the exhaust, often white or blue
If you notice any of these symptoms after refuelling, stop driving immediately.
Immediate Steps to Take After Misfuelling
If you realize you have put petrol in your diesel car, follow these steps:
Do not start the engine if you haven’t already. Starting the engine circulates petrol through the fuel system, increasing damage.
Turn off the ignition if the engine is running.
Call a professional Misfuelled Car Fixer in Cambridgeshire at 0330 122 6640 for advice and assistance.
Avoid driving the vehicle to prevent further contamination.
If you have already driven the car, inform the mechanic about how far and how long you drove.
How Professionals Fix a Misfuelled Diesel Car
Specialist mechanics in Cambridgeshire have the tools and expertise to fix misfuelled diesel cars safely. The typical process includes:
Draining the fuel tank completely to remove all contaminated fuel
Flushing the fuel system to clear petrol residues from fuel lines, injectors, and pumps
Checking and repairing any damaged components such as fuel pumps or injectors
Refilling with clean diesel and testing the engine for proper operation
This thorough approach prevents long-term damage and restores your car’s performance.
Why You Should Use a Local Misfuelled Car Fixer in Cambridgeshire
Choosing a local specialist offers several benefits:
Quick response times to reduce the risk of engine damage
Knowledge of local roads and conditions for easier vehicle recovery if needed
Trusted reputation within the community for reliable service
Access to the right tools and parts for diesel engines common in the area
Calling 0330 122 6640 connects you to experts who understand the urgency and specifics of misfuelled diesel cars in Cambridgeshire.
Preventing Petrol Misfuelling in Diesel Cars
Prevention is better than cure. To avoid putting petrol in a diesel car:
Always check the fuel pump label carefully before refuelling
Use diesel pumps that are clearly marked and separated from petrol pumps
Consider using a fuel cap lock or a nozzle adapter designed for diesel cars
Educate all drivers of the vehicle about the correct fuel type
If unsure, ask the fuel station attendant for help
These simple steps reduce the risk of costly mistakes.
What to Expect After the Repair
After your diesel car has been fixed by professionals:
The engine should run smoothly without knocking or warning lights
Fuel efficiency and power will return to normal levels
You may notice a slight smell of fuel initially, but this should fade quickly
Regular maintenance checks will help ensure no hidden damage remains
If problems persist, return to the mechanic for a follow-up inspection.




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