Oil prices fell for a second day on Tuesday as more production facilities returned to operation in the US Gulf after Hurricane Barry swept through over the weekend, while Chinese economic data dimmed the outlook for crude demand. Brent crude futures were down 10 cents, or 0.2%, at $66.38 a barrel by 0028 GMT. They fell 0.4% overnight. US crude fell by 10 cents, or 0.2% to $59.48 a barrel. The US benchmark fell about 1% in the previous session.