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An understanding of the mass burning rate of a fuel and the factors affecting this rate is paramount when assessing the hazards associated with a liquid fuel spill/pool scenario. To date, the vast majority of mass burning rate data originates [1, 2] from liquid fuel fire scenarios where the fuel layer is â€˜deepâ€™. However, recent studies [3, 4] have shown that for thin fuel layer scenarios, the maximum mass burning rate achieved is on the order of one-fifth that presented for these â€˜deepâ€™ scenarios. This study investigates the factors affecting the mass burning rate of several different liquid fuels using both fixed area and unconfined fire scenarios. A test program comprised of over 500 small- and large-scale tests was conducted on various substrates using various fuels. The results of the study demonstrate a dependence of the mass burning rate on both duration fuel supply and substrate, among others. Correlations were developed to modify the peak mass burning rates as a function of fuel supply duration (which can be depth) and the impact of substrate relative to the thermal properties of the substrate were discussed.