Hull continued their fine start to the season, but only after they were given a scare by Sky Bet League Two Exeter.
Jake Taylor gave Exeter the lead with a stunning long-range strike, but joint Premier League leaders Hull hit back to win 3-1 with two goals from Adama Diomande and a Robert Snodgrass strike.
After a relatively even first 15 minutes, Hull came within a whisker of taking the lead when the dangerous Diomande cut in from the left wing and curled a shot against the face of the crossbar.
Exeter's Liam McAlinden then rounded Dusan Kuciak, but the Tigers' goalkeeper did well to recover and make the save.