Hull made it 11 games unbeaten but were frustrated by a resilient Crystal Palace outfit in a scoreless draw at Selhurst Park.
Nick Barmby's side have now kept 18 clean sheets in the npower Championship this season, more than any other team in the division. And their defensive fortitude could yet earn them a place in the play-offs, from which they are separated by one point.
With Wilfried Zaha suspended, Palace, on a nine-game unbeaten run of their own, were lacking in creative spark but were always likely to find it difficult to break down the visitors' well-organised backline.
Corry Evans had an early sight of goal for Hull but dragged his shot narrowly wide from the edge of the box.
Both sides had late half-chances to win it but Kyle De Silva pulled his effort wide and Robbie Brady's ambitious strike did not cause any major concern for Julian Speroni.
The full-time whistle signalled a seventh draw in nine games for both clubs as Palace slipped into the bottom half of the table while City missed out on the opportunity to go fourth.