Fuel Cooling - Transit: Notes

Fuel cooling is required to maintain an acceptable fuel temperature during engine operation. The fuel system temperature is monitored by the fuel rail temperature (FRT) sensor, which is an input to the PCM. The fuel conditioning module thermostat will passively recycle returned fuel from the engine to the inlet of the high pressure fuel injection pump during low fuel temperatures, or pass it through the fuel cooler and return it to the tank for further cooling during high fuel temperatures.