Der Dieselfilter hat eienn Temperaturfühler und eine "Vorheizfunktion":
Fuel Filter Pre-Heat Function
The fuel filter features a fuel pre-heat function that operates when the return fuel temperature is below 10°C (50°F). The
pre-heat function recirculates a quantity of return fuel from the HP fuel system through the filter canister to prevent fuel
waxing, and improve the engine performance during cold running.
The fuel filter canister head incorporates a wax-type thermostatic valve and spring, located in the fuel return passage
between the HP fuel system and fuel tank return connections. The thermostatic valve is seated in a by-pass port that
connects the fuel return passage to the fuel filter canister chamber.
The thermostatic valve is operated by the temperature of the fuel in the fuel return passage, felt at the upper side of the
thermostatic valve; and the temperature of the supply fuel in the canister chamber, felt at the under side of the
thermostatic valve.
The quantity of return fuel recirculated through the filter canister chamber is proportional to the temperature of the return
fuel, and the position of the thermostatic valve.
Return Fuel Temperature ...Percentage Return Fuel to Tank ....Percentage Recirculated Fuel
Less than 10°C (50°F).............. 5 - 10% .................................90 - 95%
Greater than 20°C (68°F)......... 95 - 100% .................................0 - 5%
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