Low-viscosity fluid pressure buildup unit, pressure buildup system and engine

The invention provides a low-viscosity fluid pressure buildup unit, a pressure buildup system and an engine. Wherein the low-viscosity fluid pressure buildup unit comprises a packaging shell which is provided with a closed space; the plunger pump is used for pressurizing and outputting low-pressure low-viscosity clean fuel, is packaged in the closed space, and comprises a leakage collecting structure; the pressure building unit further comprises a monitoring device, the monitoring device is used for sensing the low-viscosity clean fuel collected by the leakage collecting structure, and if the low-viscosity clean fuel collected by the leakage collecting structure is larger than a threshold value, an alarm signal is output. 本发明提供低粘流体建压单元、建压系统、发动机。其中，所述低粘流体建压单元包括封装壳体，提供有密闭空间；柱塞泵，所述柱塞泵对低压的低粘清洁燃料加压输出，封装于所述密闭空间内，所述柱塞泵包括泄漏收集结构；其中，所述建压单元还包括监测装置，所述监测装置用于感测所述泄漏收集结构收集的低粘清洁燃料，若所述泄漏收集结构收集的低粘清洁燃料大于阈值，则输出报警信号。