A rampant Whitecaps never looked like being troubled by Austin as they cruised to a dominant victory that leaves them four points clear at the top.
Vancouver went in front in the 13th minute. White finished with ease.
White doubled Vancouver's tally in the 38th minute after a poor clearance from Austin goalkeeper Brad Stuver. Sabbi turned goalscorer in the 47th minute.
White completed his hat-trick in the 59th minute to make it 4-0, and only a superb goalkeeping performance from Stuver, who pulled off a series of fine saves, including from a 72nd-minute Giuseppe Bovalina penalty, prevented Vancouver from adding to their total.
Eventually, Austin's resistance was broken again, White grabbing his fourth of the game in the 82nd minute. Austin finally got on the scoresheet in the 90th minute with a long-range consolation strike from Dani Pereira.