Standard Fuel Gas Train
From Major Bi-Fuel System, Components and Sub-Systems
Conditioning and regulating the natural gas prior to admission into the engine is a critical part of the GTI Bi-Fuel system. The system 'gas train' includes a 50-micron fuel filter, a manual shutoff valve, an electrically operated solenoid valve actuated in the event of an emergency or for system shutdown, and a zero-pressure, demand-type gas pressure regulator. This latter component reduces the inlet gas pressure (.5–4 psig) to roughly atmospheric pressure. With a negative outlet pressure, the design allows the system to use a 'demand' control scheme whereby engine intake airflow determines the gas flow of the engine. As engine load changes, corresponding changes in intake air volume automatically draw additional fuel into the mixer.
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