Am I correct in thinking I need a lockable filler cap, with the cap tethered to the filler and the key on the same ring as the car key, with the ring welded so they cannot be separated?

In that case I assume a secondhand motorcycle cap would be suitable?

[Edited on 6/10/09 by alistairolsen]

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The fuel filler cap must either be tethered to the vehicle or be of a lockable type where the key can only be removed when the cap is locked or an automatically opening and closing, non-removable fuel filler cap

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not quite

The cap must either be teathered to the car OR must be the same key as the ignition.

it is so the cap can not be left behind when you drive off

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Originally posted by matt_claydon

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The fuel filler cap must either be tethered to the vehicle or be of a lockable type where the key can only be removed when the cap is locked or an automatically opening and closing, non-removable fuel filler cap

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Originally posted by tomgregory2000
OR must be the same key as the ignition.

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Originally posted by alistairolsen
Am I correct in thinking I need a lockable filler cap, with the cap tethered to the filler and the key on the same ring as the car key, with the ring welded so they cannot be separated?

In that case I assume a secondhand motorcycle cap would be suitable?

[Edited on 6/10/09 by alistairolsen]

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16. The fuel filler cap must either be tethered to the vehicle or be of a lockable
type where the key can only be removed when the cap is locked or an
automatically opening and closing, non-removable fuel filler cap

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download the manual below

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Originally posted by tomgregory2000
not quite

The cap must either be teathered to the car OR must be the same key as the ignition.

it is so the cap can not be left behind when you drive off

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Having a locking cap and the key on the same ring as the ignition key, prevents one of the most common ways of stealing cars; Hang around a petrol station waiting for someone to leave there keys in the ignition when they go to pay.

Having seen 2 people drive off in kits from the petrol station in the last few months I think a tether is a good idea. One did a few miles and returned to find the cap still on the pump and the other stopped 5 miles down the road to find the cap rolling about on the boot (jammy gits).
I'm going to rivet a length of chain to the bottom of my cap with a T bar (welding rod?) on the other end. Then just feed it into the filler and the T won't come out without a fiddle.

adrian

I once drove off leaving my filler cap on the pump in Leicester - I found out when I stopped for a top-up in Maidstone
Nowadays when I fill up I put the cap on the back of the car next to the fuel filler............and replace it BEFORE I replace the nozzle in the pump . I cant lock it since I lost the key

To comply with IVA rules I tethered mine as my cap is locking but the key can be removed when its unlocked.

I used some chain used to secure a plug for a sink, i use a rivet to the plastic bit in the cap, and a clip around one of the air return holes in the unleaded flap.