Introduction
Diesel in a petrol car is a common mistake that can happen to any driver, especially during busy commutes or at unfamiliar fuel stations. Recognising the signs early can prevent costly engine repairs.

Common Signs of Diesel in a Petrol Car

• Engine won’t start – Diesel can block spark plug combustion.
• Knocking or misfiring – Engine sounds irregular or struggles to run.
• Excessive smoke – Black or grey smoke may appear from the exhaust.
• Poor acceleration – Car feels sluggish and struggles to gain speed.
• Fuel smell – Strong diesel odour may be noticeable inside or around the car.
  
  What to Do
• If you spot any of these symptoms, switch off your engine immediately and call a professional. Driving further will circulate the wrong fuel and cause more damage.
• Professional Recovery
• At Wrong Fuel Doctors, we provide 24/7 diesel drain and recovery services across London, including Hounslow, Ealing, and Shepherd’s Bush. Our team can safely drain, flush, and refill your tank, getting you back on the road quickly.