After a late winter overhaul, she returned to the Pacific theater in February 1944 operating in support of Vice Admiral Marc A. Mitscher's carrier force during the Truk campaign. A short break at Pearl Harbor ended as "Guadalupe" sailed 11 May to operate in support of the US 5th Fleet during the Marianas campaign. From there she sailed in late August to support Admiral William F. Halsey's US 3rd Fleet in action against the Japanese in the Palau Islands and Philippines operating areas. One of her major tasks was refueling ships during the climactic Battle of Leyte Gulf.