curprev19:4219:42, 5 December 2018 JustinTime55talkcontribs 4,166 bytes+142 →top: Correct photo caption; that is an APS similar, but not identical to the one that was SOMETIMES used for an ullage function. A better picture needs to be found.undo
curprev00:0000:00, 23 November 2010 Jean15paultalkcontribs 2,352 bytes+581 Rewrote article. Provided more background information on why and when ullage motor are used. Reorganized existing info into more logical order.undo