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Fuel quality has a significant impact on the lifespan and smooth operation of petroleum engines. Many dishonest merchants mix lower priced oil/ingredients with petroleum products to increase their profit. To solve this problem, a terahertz waveguide-based fuel adulteration sensor that can detect the presence of kerosene in gasoline is proposed. The design procedure is performed by large elliptical hollow core photonic crystal fiber including rectangular cladding. In our study, the used sensor’s performance is investigated and FEM is also used for performing numerical analysis. Our used sensor achieved a maximum 80.34% sensitivity with a negligible total loss having 3.74 × 10⁻² cm⁻¹ during 2.8 THz optimum operating frequency conditions which are very impressive. Additionally, under ideal circumstances, the used sensor attained a sound birefringence of 0.01 and 0.034 ranging numerical aperture. The …