In the description of Aura Perception [Auspex 2] it is mentioned that the Aura of a Kindred looks pale in comparison to one of a mortal.
Would faking life help in "masking" that fact?
Or is it impossible to "fake" one's aura?
No, burning blood does not affect a vampire's aura.
Burning blood does not affect your aura; it only affects your physical appearance. You need a discipline or ritual to change your aura. An example is Obfuscate 2: Mask of Tranquility which hides predator's taint.