Limerick made it four wins from four when dispatching Antrim in the Cushendall sunshine, 3-21 to 0-13.
Victory means the Treaty County now face a winner-takes-all promotion decider against Galway in Round Five next weekend. Even a draw at Salthill in seven days would be enough to see them end their eight-year love affair with the second tier.
Despite being severely depleted this afternoon, John Kiely's men coasted. Neil McManus' precise free-taking had the hosts still in touch after 26 minutes, 0-7 to 0-6, but substitute Oisin O'Reilly's major seven minutes from the break gave the winners a double scores interval advantage, 1-13 to 0-8.
Aaron Gillane (1-5) and Graeme Mulcahy (1-2) delivered the second and third Limerick goals in the 45th and 70th minutes respectively as the visitors won by a 17-point margin in the end.
Limerick - B Hennessy; T Condon, R McCarthy, R English; D Byrnes (0-4, 3f), D Hannon, D Morrissey; P Browne (0-1), C Ryan (0-3); D Reidy (0-4, 1f), C Lynch, B O'Connell (0-2); A Gillane (1-5, 0-3f), S Flanagan, G Mulcahy (1-2). Subs: O O'Reilly (1-0) for S Flanagan, A La Touche Cosgrave for A Gillane, P O'Loughlin for D Morrissey, D Fanning for R English.
Antrim - R Elliott; A Graffin, J Dillon, S Rooney; R McCambridge, D Kearney, J Mackey; E Campbell (0-1), C McKinley; J McNaughton, M Armstrong (0-1), N McManus (0-8, 7f); D McKinley, C McCann (0-1), N Elliott (0-2). Subs: N McAuley for J Mackey, C Carson for J McNaughton, P Burke for R McCambridge, D McCloskey for D McKinley.
Referee - J O'Brien.