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What should you do to reduce the risk of your vehicle catching fire?

Keep water levels above maximum
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Check out any strong smell of fuel
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Avoid driving with a full tank of fuel
Use fuel additives

DVSA theory test explanation

The fuel in your vehicle can be a dangerous fire hazard. If you smell fuel, check out where it's coming from. Never use a naked flame near the vehicle if you can smell fuel, and never smoke when refuelling your vehicle.