Fuel PREHEATER
A fuel heat exchanger is installed in feed line of vehicle heater to preheat the fuel. With full preheating up to 50°F (8°C), the required fuel is guided through the fuel heat exchanger. The system has a mixed operation from 50-80°F (8°-25°C). The required fuel flows partially via the fuel heat exchanger. Above 80°F (25°C) the fuel heat exchanger is shorted by a thermostat and no more fuel will follow through the fuel heat exchanger. See Fig 1 .