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A comprehensive analytical and experimental program that resulted in an advanced computerized analysis for predicting the performance of a fluorine-hydrogen Main Tank Injection (MTI) pressurization system for LH 2 -fueled space vehicles is described. Accuracy of the analysis was verified by a series of 17 tests of a fullscale MTI pressure control system in a 1000 ft 3 flight-weight LH 2 tank. Prepressurization, constant-pressure hold, and LH 2 expulsion at controlled tank pressure were demonstrated over a wide range of ullage volumes, pressures, flowrates, and injector configurations, with reasonable ullage gas and tank-wall temperature and efficient fluorine usage. Nomenclature a C d f fm = T -U = W = X = A P Subscripts b C F,F 2 = 9 = H 2 ,HF = J = m -M = mix = P = r = u = o =