(Adds Motiva no comment)
HOUSTON, Feb 22 (Reuters) - Motiva Enterprises' 600,000 barrel per day Port Arthur, Texas, refinery wasrestarting a gasoline-producing fluid catalytic cracking unit onFriday after a three-day shutdown for repairs, said sourcesfamiliar with operations at the refinery.
The restart began on Thursday night, the sources said. TheFCC was shut on Monday to repair a leak in a pipe to a storageunit.
A Motiva spokeswoman declined to discuss the status of theFCC.
Motiva is a 50-50 joint venture between Royal Dutch ShellPlc and Saudi Aramco. Motiva's Port Arthurplant has the largest crude oil refining capacity in the UnitedStates. (Reporting by Erwin Seba; Editing by Gerald E. McCormick andLeslie Adler)