You're driving a car that has a diesel engine. What can a loose filler cap on your fuel tank cause? You're driving a car that has a diesel engine. What can a loose filler cap on your fuel tank cause?

• Possible answers:

   
• A. It can make the engine difficult to start
• B. It can make the roads slippery for other road users
• C. It can improve your vehicle’s fuel consumption
• D. It can increase the level of exhaust emissions