Any process that activates or increases the frequency, rate or extent of L-leucine import across plasma membrane.
Synonyms:
narrow_synonym:
activation of L-leucine import into cell; activation of leucine import into cell; positive regulation of L-leucine import into cell; up regulation of L-leucine import into cell; upregulation of L-leucine import into cell
broad_synonym:
positive regulation of leucine import across plasma membrane