HJ Sandman non locking petrol cap

[Taily]

That is an HZ or later cap. The earlier HQ/HJ caps don't have the double attachment arrangement and are the same as the earlier Holdens such as HR etc.
That double attachment/locating pins is painful to undo if you don't know about it!

Agreed, they can be a pain in the RRR's if you're not used to them, but you are incorrect about the HQ/J caps. The pic in that link is a vented commercial cap.

IMG_1836.jpg

The pic above is a pic of my original cap (I cannot find any documentation or dealer paperwork that says it was either removed or replaced at all apart from a reciept for a locking cap about three months after they took delivery of it - must have been those mongrel westie Parramatta teenagers syphoning juice again ) fitted to my HJ, you can clearly see it is as you describe it shouldn't be.... Funnily enough it also fits my HX ute trailer filler neck and my WB panno filler neck as well....

I feel some of you might be getting mixed-up between HQ-HZ sedan/wagon caps and HQ-WB ute/panel can caps. Two totally different designs between them. Happy to be wrong though the earlier caps may not have been vented, which is easy enough to do with a standard cap and a drill when they started to piddle raw fuel into the charcoal cannister (was a known issue in early HJs).

Regards,

Dave.