822345 Volvo.Penta Tube

Illustration 1 g06401596The fuel flows from the main gas supply through a knock-down regulator. A knock-down regulator is a second regulator that is needed when the gas supply pressure is too high for a single regulator to manage.From knock-down regulator, the fuel flows to the fuel filter. Usually, the fuel filter is a component of the design at the particular site. The customer is responsible for supplying clean, dry fuel to the engine. The fuel filter may be supplied by Caterpillar or by the customer. To prevent particles from entering the engine, a 1 micron filter is recommended. Select a filter that is properly sized for the required gas pressure.The recommended location of the fuel filter is close to the engine, before the engine gas pressure regulator. Pressure gauges in the gas lines on each side of the fuel filter are recommended to monitor the filter differential pressure. A manual shutoff valve in the gas line before the fuel filter will facilitate servicing of the filter.The regulator should be sized so that the supply pressure to the tecjet fuel valve is between 0.5 psig minimum at rated load and 5 psig maximum at idle. The regulator must be able to provide constant pressure to the tecjet from cranking speed to full load.The steady state fuel pressure stability requirement is 6.9 mbar/sec ( 1 psi/sec).The transient fuel pressure stability requirement is 48.2 mbar/sec ( 7 psi/sec).Less gas pressure may result in reduced power. More gas pressure may result in instability.The fuel flows from the gas pressure regulator to the Gas Shutoff Valve (GSOV).The control system is configured for a GSOV that is energize-to-run. This statement means that the GSOV must be energized in order for the valve to open and supply gas to the engine. The GSOV may be energized by the customer equipment or by the ECM. When power is removed from the GSOV the engine stops.The solenoid for the GSOV may be connected to engine wiring harness or to a harness that is supplied by the customer. In either case, the customer may install a switch that can interrupt the circuit.The fuel flows to the electronically controlled fuel metering valve . The ECM issues a command signal to the fuel metering valve via the CAN data link. The fuel metering valve regulates the flow of fuel to the engine.The fuel metering valve controls the volume of fuel that flows to an adapter in the air inlet elbow. The inlet air that is necessary for combustion enters through the air inlet elbow. The air/fuel mixture enters turbocharger compressor.The compressed air/fuel mixture flows to the aftercooler. The temperature of the compressed air/fuel mixture is reduced in the aftercooler resulting in an increased density of the air/fuel mixture, resulting in more efficient combustion.The cooled air/fuel mixture flows to the electronically controlled throttle. The ECM issues a command signal to the actuator for the throttle via the CAN data link. The signal is based on the desired engine speed. The throttle controls the volume of the air/fuel mixture that flows through the intake manifold.The manifold distributes the air/fuel mixture to the cylinders for combustion.