Function of the injection system: - ra07056020010x(0010)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
E. Fuel preheater (148) Engines 602.96, 603.96/97 TURBO (Model 463.3 : pay attention to deviations)
E. Fuel preheater (148)
A heat exchanger (148) is installed in the inlet line of the heater to preheat the fuel.
Heat exchanger
Function
Full preheating up to + 8 °C fuel temperature; the required fuel is drawn in through the heat exchanger by the fuel pump.
From + 8 °C up to + 25 °C mixed operation; the required fuel flows partially through the heat exchanger.
Above + 25 °C the heat exchanger is bypassed by the thermostat; the fuel is drawn in directly by the fuel pump. Fuel preheating ensures trouble-free operation with winter-grade diesel fuel as a rule down to approx. -25 °C ambient temperature.
Fuel thermostat