They are self pollinating.They can be hand pollinated too.Pick up one flower and rub it face to face with rest of the flowers.These flowers are really eye catching beauties.

I am posting a pic.of Scarlet runner bean with beautiful flower from my file.{{gwi:132847}}

There was a previous thread on this. The link is below. - Dick

Here is a link that might be useful: Runner bean pollination

Thanks for the responses! I read the previous thread and it only suggests using bees, not how you can do it by hand without insect pollinators. I'll try rubbing them face-to-face like chaman mentions, but am still open to suggestions.