The Type dimension of Fuel Oil Leak Detection Systems segmentation distinguishes four primary technologies: Acoustic sensors, which monitor sound signatures generated by fluid escape; Optical Fiber sensors, leveraging changes in light transmission to pinpoint leaks; Conductivity sensors, detecting alterations in electrical conductivity caused by oil‑water mixing; and Thermal Imaging systems, which identify temperature differentials associated with leaking fuel. Acoustic solutions dominate the market due to their proven reliability in harsh marine environments, contributing roughly 40% of total revenue. Optical fiber devices, prized for their high spatial resolution, account for about 25%, especially in fixed‑installations such as power‑generation plants. Conductivity sensors, favored for their low cost and ease of integration, represent 20% of the market, primarily in industrial facilities where bulk fuel storage is common. Thermal imaging, while niche, commands the remaining 15% by addressing safety‑critical applications where rapid visual confirmation of a leak is essential. Collectively, these sub‑types shape the overall market size by aligning technology capabilities with sector‑specific risk profiles.