More then likely P edulis - the one used for passionfruits. If you can take a pic of the flower, thats the best way to ID these guys

Edulis doesn't make orange fruits, they all turn from green to purple....

Ask they guys on this forum w/pics. They will know:

http://tropicalfruitforum.com/

i don't have any pictures of flowers from our vine, but they look exactly like the ones in this picture i found online.

thank you melikeeatplants. i've determined from tropical fruit forum that it's most likely Passiflora caerulea, which is edible, but not particularly tasty.

I am in CA too, our passion fruit does the green to purple fruit with much larger leaves.

They sprout really easy from seeds, not sure what yours tastes like, ours makes some fine jelly!

I've been reading a bit about passiflora and passion fruit, and I'd like to grow a few varieties. I'm in zone 10. Does anyone have experience with the following ? and maybe one of them is your vine fenster:

'P. ligularis (sweet granadilla),

P. miniata (red granadilla) ,

P. edulis 'flavicarpa' (Lillikoi), (package of seeds says requires temps over 60, which is zone 13)

P. Incarnata,

P. gabrielliana, or

P. Etna.

This site has a bunch of varieties -- maybe could help you identify yours...

http://gkplants.com/collections/passiflora-hybrids/edible-fruit

or this one

http://www.tradewindsfruit.com/content/lilikoi.htm