Guidance summary
Secure the cap and stop fuel leaks
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After refuelling, fasten the filler cap securely and check its seal and the tank for damage. Avoid overfilling; report a forecourt spill immediately. Diesel on the road sharply reduces grip, especially for motorcyclists. Replace a missing cap with a correctly sealing replacement before continuing; a rag is not a suitable substitute.
Source: Secure the cap and stop fuel leaks
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