* Several U.S. refineries, pipelines reopen after Harvey
* More than 11 pct of U.S. refining capacity still offline
* Two new hurricanes developing near Gulf of Mexico
* OPEC seen extending cuts beyond Q1 2018 (Adds settlement prices, Port Arthur and Mexican crude delays)
By Libby George
NEW YORK, Sept 5 (Reuters) - Crude oil prices rose and gasoline fell by about 3 percent on Tuesday as the gradual restart of refineries in the U.S. Gulf that were shut by Hurricane Harvey raised demand for crude and eased fears of a fuel supply crunch.
Texas was edging towards recovery from the devastation of Harvey that hit its coast late on Aug. 25, as shipping channels, oil pipelines and refineries restarted some operations. At its peak, the hurricane knocked out almost a quarter of all U.S. refining capacity.
On Tuesday, sources said Motiva Enterprises could begin restarting the 603,000 barrel per day (bpd) Port Arthur refinery, the nation’s largest, this week.
Crude oil infrastructure was also still recovering from the storm. Mexico’s Pemex said on Tuesday that the storm forced the cancellation of several crude oil export shipments.
“This is kind of a boomerang,” said John Kilduff, partner at energy hedge fund Again Capital, noting that just after the storm, the fear was gasoline shortages. “Today, there’s a bit of a worry in the short term that there could be an issue around crude supply.”
U.S. gasoline futures dropped 3.15 percent from their last close to $1.69 per gallon, down from $2.17 on Aug. 31 and back to levels last seen before Harvey hit the U.S. Gulf Coast and its large refining industry.
U.S. crude futures settled up $1.37 at $48.66 per barrel after trading earlier in the day as high as $48.98, a three-week high.
Brent crude ended $1.04, or 2 percent, higher at $53.38 per barrel.
Signals that the Organization of the Petroleum Exporting Countries could extend its output limits beyond the first quarter of 2018 also boosted prices, as did a weak U.S. dollar .
But another hurricane - Irma - strengthened on Tuesday into a Category 5 hurricane, the most powerful storm on the Saffir-Simpson scale with sustained winds of over 157 miles (253 km)per hour.
The U.S. National Hurricane Center’s forecast path for the storm has Irma passing south of Florida on Sunday on its way into the Gulf of Mexico.
Again Capital’s Kilduff said worries that Irma could veer into the U.S. oil and gas platforms in the Gulf, also underpinned prices, though the NHC said it is too early to determine the direct impacts Irma might have.
September is typically the peak of the hurricane season. Another storm is developing behind Irma in the Atlantic, and an area of bad weather in the southwest Gulf of Mexico threatens to become a tropical storm in the next two days.
Additional reporting by Dmitry Zhdannikov in London and Henning Gloystein in Singapore; Editing by Marguerita Choy