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Through resistivity measurements of an organic crystal hosting massless Diracfermions with a charge-ordering instability, we reveal the effect ofinteractions among Dirac fermions on the charge transport. A low-temperatureresistivity upturn appears robustly irrespectively of pressure and is enhancedwhile approaching the critical pressure of charge ordering, indicating that theinsulating behavior originates from short-range Coulomb interactions.Observation of apparently vanishing gap in the charge-ordered phase accordswith the theoretical prediction of the non-topological edge states.

Insulating nature of strongly correlated massless Dirac fermions in an organic crystal