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Shanghai, November 2, 2026 — Shanghai Size Test & Control Technology Co., Ltd. (STT) announced that a high-precision helium leak test system custom-designed for high-pressure fuel rails has completed factory commissioning and acceptance and has been officially loaded and shipped to a well-known chinese automotive components manufacturer. The system integrates vacuum-chamber helium leak testing, helium recovery, and MES data connectivity, among other customized functions, to comprehensively support the customer in improving quality control and production efficiency for key fuel system components.
High-pressure fuel rails are core components of gasoline direct injection fuel systems. They operate under high pressure for extended periods and are subject to extremely stringent sealing performance requirements. The dedicated system shipped this time has been deeply customized to the structural characteristics of high-pressure fuel rails and the customer’s production line requirements, with the following core technical advantages:
Vacuum-chamber helium leak testing: The system uses a high-sensitivity vacuum chamber method with helium as the tracer gas, enabling accurate detection of micro-leaks in high-pressure fuel rails and ensuring high consistency of outgoing product quality.
Human-machine collaboration and automated inspection: The system adopts an operating mode of “manual loading/unloading + automatic sealing + automatic gas filling and testing.” While maintaining production line flexibility, the automated sealing and gas filling processes effectively eliminate human error and ensure stable inspection cycle times and accurate results.
Helium recovery and boosting system: Considering the cost of helium as a rare gas, the system is specially equipped with a helium recovery and boosting system, significantly improving helium utilization and effectively reducing the customer’s long-term operating costs, in line with green manufacturing principles.
MES data connectivity and full lifecycle traceability: The system is equipped with barcode scanning and MES data upload functions, enabling real-time collection, automatic judgment, and cloud-based traceability of workpiece inspection data, providing reliable data support for quality analysis.
Flexible quick-change tooling design: The tooling supports rapid changeover and can flexibly accommodate mixed-line production of high-pressure fuel rails in multiple models and specifications, significantly enhancing the production line’s flexible manufacturing capacity.
Since its establishment in 2008, STT has long focused on gas-tightness testing equipment, instruments, and technical services, accumulating extensive experience in vacuum technology, helium mass spectrometry leak detection, and automated control. The company’s products are widely used in automotive powertrain systems, new energy batteries, thermal management components, wheels, refrigeration systems, and other applications, serving leading automotive components manufacturers in China and abroad.
The delivery of this high-pressure fuel rail helium leak test system is another important implementation case for STT in the field of precision inspection for automotive fuel systems. It also further demonstrates the company’s technical strength and engineering experience in helium leak testing applications combining high pressure and micro-leak detection, with test pressures of up to 750 bar.
In response to the comprehensive requirements of high-pressure fuel rails for leak rate, inspection cycle time, cost control, and digital management, STT has provided the customer with traceable and replicable precision leak detection capabilities through a customized equipment integration solution.
Founded in 2008, Shanghai Size Test & Control Technology Co., Ltd. focuses on the R&D and manufacturing of gas-tightness testing equipment, instruments, technologies, and services. The company has industry-leading technologies in vacuum technology, helium leak detection, and automated control systems. STT's products are widely used in automotive components, new energy batteries, air conditioning and refrigeration, 3C electronics, medical devices, and other industries.
Shanghai Size Test & Control Technology Co., Ltd.
Email: sales.sz@size-auto.com
