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Wikipedia mentions carpenter bees are quite capable. Which probably explains how my neighbor's gets pollinated. I know it's certainly not by hand.

The purple passion fruit commonly grown in New Zealand (not native) doesn't need manual pollination. Not sure what does it, though there are many introduced honey bees and bumblebees alongside some native pollinators like butterflies.

I'm sorry, but could you provide a source on this? I know for a fact I grew up eating wild passion fruit from our property in the Ozarks.

I've found wild passion fruit growing on my farm in East Texas. It had plenty of fruit growing on it.

Passion fruit isn't native to the US. Are you sure it was indeed passion fruit?

This page from the University of Florida disagrees.

https://gardeningsolutions.ifas.ufl.edu/plants/ornamentals/p...

I did some more research and I see that there is a Passiflora species (P. incarnata) that grows in Texas, but that isn't what is generally referred to as passion fruit. P. edulis would be what the above commenter is referring to.