UPDATE 2-Sunoco restarts Philadelphia refinery FCC -sources

(Adds restart timeline, paragraph 4)

HOUSTON, May 27 (Reuters) - Sunoco Inc (SUN.N) restarted the larger of two gasoline-producing fluidic catalytic cracking units on Wednesday morning at its 335,000-barrel-per-day (bpd) Philadelphia refinery, according to sources familiar with refinery operations.

The FCC unit was shut after an equipment breakdown on Tuesday.

A Sunoco representative was not immediately available to discuss refinery operations.

The large FCC began restarting on Tuesday night after a UDEX unit, which takes out benzene and toulene from gasoline restarted, according to a city regulator. A reformer unit boiler restarted on Wednesday morning.

A smaller cat cracker at the Philadelphia refinery remains offline for necessary work prior to restarting after an April shutdown due to economic run cuts.

Sunoco wants to restart the smaller FCC to make up for gasoline production lost when a cat cracker at the company's Marcus Hook, Pennsylvania, refinery was shut last week due to an explosion in a nearby ethylene unit. (Reporting by Erwin Seba; Editing by David Gregorio)