Keith Beirne scored a goal in each half and a total of two goals and eight points as Leitrim landed their first victory of the league season.
Leitrim move off the bottom of the table and move about the bottom two in the league table after throwing the form book out the window.
Keith Beirne fired over three points in the first four minutes, the first after 55 seconds. Josh Ryan equalised a minute later, the only time in the game that the sides were level.
Beirne inspired Leitrim forward as they led 1-10 to five points at half-time.
Benny Guickan’s men limited Limerick to just four second half points as Leitrim added one goal and eight points to their second half tally.
Paddy McGill got the reaction of Shannonside match analyst Martin McHugh.