* U.S. front-month crude pressured by expiry-traders
* U.S. crude inventories likely fell last week-poll
* Coming up: Fed announcement at 2:15 p.m. EDT Tuesday (Recasts, updates prices, market activity, changes byline and dateline from previous LONDON)
By Robert Gibbons
NEW YORK, Sept 21 (Reuters) - Crude oil fell for the fifth time in six days on Tuesday amid concerns over the outlook for the global economy and oil demand and as investors awaited results from a key Federal Reserve policy meeting.
The U.S. central bank is expected to restate its existing policy with no fresh stimulus and interest rates kept at almost zero, but the Fed has come under pressure to inject more money into its sluggish economy. [
]The October U.S. crude contract expiration and high U.S. oil inventories kept pressure on the front month and helped push nearby months lower, industry sources said.
U.S. crude for October <CLc1> delivery fell $1.79, or 2.39 percent, to $73.07 per barrel by late morning, its biggest percentage drop since Aug. 31. That day also was a Tuesday ahead of weekly oil inventory reports and one with expiring contracts on tap, though they were for refined products.
U.S. November crude <CLc2> fell 99 cents, or 1.3 percent, to $75.20 a barrel.
ICE Brent for November <LCOc1> fell 54 cents to $78.78.
The premium for November Brent over the equivalent U.S. benchmark West Texas Intermediate contract rose above $3.50 on Tuesday. The premium shrank below $2 when a leak forced the closure of the biggest Canada-U.S. crude pipeline but widened when it became apparent flows would resume last week. (Graphic of Brent-U.S. crude spreads: http://link.reuters.com/buc74p)
"Some of the weakness is (Enbridge Inc's Canada-U.S.) pipeline coming up because the market rallied significantly on the line being shut," said Mark Waggoner, president at Excel Futures Inc in Bend, Oregon.
"And you have the unwinding of the October contract and that is dragging down the (nearby months) and everyone's cautious waiting for the Fed."
The Federal Reserve's policy announcement after its meeting is expected around 2:15 p.m. EDT (1815 GMT) on Tuesday.
U.S. stocks slipped as caution ahead of the Federal Reserve's meeting overshadowed upbeat housing data. [
] U.S. residential construction rose more than expected in August to a four-month high, the Commerce Department said. [ ]CHINESE DATA
Chinese figures offered some support for prices on Tuesday. China's apparent oil demand rose 8.2 percent in August over a year earlier, rebounding from July, Reuters calculations from official data showed. [
]But U.S. oil inventories remain high, with crude oil, distillate and gasoline stock levels all well above year-ago levels in the government's report for the week to Sept. 10.
Crude inventories probably fell last week because of lower imports from Canada due to the Enbridge pipeline outage and as tankers navigated around stormy weather, a Reuters survey of analysts showed on Monday. [
]Industry group the American Petroleum Institute will publish U.S. oil inventory data for the week to Sept. 17 at 4:30 p.m. EDT (2030 GMT) on Tuesday. The U.S. Energy Information Administration will release its data on Wednesday at 10:30 a.m. EDT (1430 GMT). (Additional reporting by Christopher Johnson in London and Alejandro Barbajosa in Singapore; Editing by Lisa Shumaker)