Oil falls as pipeline outage weighs on US Gulf Coast refinery runs

Oil prices fell on Tuesday as the prospect of the main US East Coast gasoline pipeline remaining shut for the rest of this week led some US Gulf Coast refiners to cut output, denting their appetite for crude.

US West Texas Intermediate (WTI) crude futures fell 40 cents, or 0.6%, to $64.52 a barrel at 0247 GMT, after gaining 2 cents on Monday.

Brent crude futures dropped 45 cents, or 0.7%, to $67.87 a barrel, after climbing 4 cents on Monday.

Colonial Pipeline, which transports more than 2.5 million barrels per day (bpd) of gasoline, diesel and jet fuel, shut down its network on Friday after being hit by a cyberattack.

"It's quite possible we'll see reduced crude oil demand. Some refineries in Texas have already scaled back runs because of the pipeline being out," said Lachlan Shaw, National Australia Bank's head of commodity research.

"That will weigh on crude oil prices pretty obviously, even though parts of the pipeline are restarting and Colonial is expecting the pipeline to be back to capacity by the weekend."

Colonial said on Monday it aims to resume full operations by the end of this week. The outage, however, has already led Motiva Enterprises LLC to shut two of three crude units at its 607,000 bpd Port Arthur refinery in Texas, the largest in the United States.

Total SE also cut gasoline output on Monday at its 225,500 bpd Port Arthur refinery due to the pipeline outage.

The benchmark US gasoline futures contract, which spiked after the outage, has now retreated to pre-Friday levels on the prospect of the restart. On Tuesday, the contract was down 0.6% at $2.1212 a gallon.

On the positive side for crude, analysts are expecting data to show US crude inventories fell by about 2.3 million barrels in the week to May 7, following an 8 million-barrel drop the previous week, according to a Reuters poll.

Gasoline stocks are expected to have fallen by about 400,000 barrels, six analysts estimated on average ahead of reports from the American Petroleum Institute industry group on Tuesday and the US Energy Information Administration on Wednesday.