Colonial Pipeline has restarted its primary gasoline line six days after an explosion in Shelby County, Alabama that killed one worker, injured four others and sparked a fire that burned for days within the pipe.

A statement from Colonial says the line was restarted at 5:45 a.m. Sunday after crews replaced the segment of pipe that was damaged in the explosion, but that "it is expected to take several days for the fuel delivery supply chain to return to normal."

The pipeline carries 1.3 million barrels of refined gasoline per day from Houston refineries to distribution centers in the Southeast and East Coast, and is a key part of the country's gasoline distribution system.

It's been described as the largest gasoline pipeline in the United States, and estimated to carry 40 to 50 percent of all the gasoline used on the East Coast.

The map below, released by Colonial, shows how quickly they expect gasoline to return to different parts of their system.

The pipeline explosion occurred just before 3 p.m. on Oct. 31, when subcontractors working for the L.E. Bell Construction company were working to excavate the line for maintenance, which Colonial said was related to a gasoline leak in September that released an estimated 336,000 gallons of gasoline into an inactive coal mine about five miles east of the explosion site.

Colonial said one the subcontractors struck the line with a trackhoe, as they were digging the dirt around it, which sparked the blaze that was visible for miles throughout the Birmingham area. First responders described the scene as a burning geyser of gasoline, or "like Old Faithful with smoke and fire."

The National Transportation Safety Board is investigating the explosion, and the Pipeline and Hazardous Materials Safety Administration is still investigating the cause the of the September leak.

Though both incidents occurred near the Cahaba River, it is believed neither one affected the river, which is home to several federally protected species of plants and animals.