Experiments performed on the Impurity Study Experiment (ISX-A) tokamak have shown that poloidally asymmetric injection of hydrogen gas can alter the inward transport of injected impurity atoms. The observed transport times and the magnitude of the flow reversal effect have been compared with a model based on the neoclassical theory of impurity transport; the observations are found to be consistent with theory. The diffusion coefficient is between once and twice neoclassical. Uncertainties in the radial profiles do not, however, permit a truly definitive test of the theory.