Coke Zero 400 finally under way at Daytona after lengthy rain delay

The engines have fired and the Coke Zero 400 is finally under way at Daytona International Speedway after a three-and-a-half hour rain delay.

For the second consecutive night, rain has plagued the proceedings at DIS.

After rain delayed the start of Saturday night's XFINITY Series event by about an hour, heavy downpours returned to DIS around 6:30 p.m. ET Sunday -- some 90 minutes before the Coke Zero 400 was scheduled to begin.

Sprint Cup Series drivers must complete 81 laps of the scheduled 160-lap distance for the race to be called official on Sunday night.