FELV Contagious?

For the last year I have been feeding a stray kitty who has been coming to my door, I have been giving him food outside my house, never allow her to come inside, I always leaver her food in the grass outside my apartment and she has never been in touch with my cats, some times I clean her food but immediately wash my hands. But after reading and reading I realizes about the FELV and I am worried I can give it to my cats, is it any risk Should I stop feeding this cat outside my house? Taski