What should you do if you've lost the filler cap for your diesel tank?
- A Get a replacement before driving
- B Push a rag into the filler pipe
- C Drive slowly back to your depot
- D Only fill the tank half-full
Why this is the answer
Do not drive without a fuel filler cap in place, as fuel could spill onto the road, especially when you're cornering or turning at a roundabout. Diesel fuel will make the road surface extremely slippery. Any spillage should be reported, so that the emergency services can make the road safe.
Why the other answers don't fit
- B
- Push a rag into the filler pipe — A rag is not a seal, and it can be pulled out or fall in.
- C
- Drive slowly back to your depot — A slow drive back is still a drive with an open tank spilling at every corner.
- D
- Only fill the tank half-full — A half tank sloshes just as freely out of an open filler.
Where this comes from
- Driving Buses and Coaches — section 13
- Driving Goods Vehicles — section 13
Rule numbers link to The Highway Code on gov.uk.
Where this question comes from
The question, its options and the explanation are reproduced word for word from the DVSA revision question bank under licence. The licence requires them to appear unaltered, so we cannot reword them and neither can anyone else — that is why you will meet the same wording on other sites. Everything else on this page is written by Theory Hub: the explanation of why each wrong answer is wrong, the topic guide and the revision notes.
Asked in: Lorry & Bus (LGV/PCV)
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