GAS TRAIN

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, 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 (3 ±1psi) 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.