E 450 V8-6.0L DSL Turbo VIN P (2004)
The regulator contains a pressure relief device, a 1,896 kPa (275 psig) check valve, which protects the low pressure fuel system. The low pressure fuel
system no longer must fulfill the design requirements of the high pressure fuel system, therefore reducing cost, weight and complexity.
When gas expands, the fuel temperature drops significantly causing extreme cold temperatures (-177°C or -160°F) that may damage synthetic fuel
system components as well as cause water vapor within the fuel to condense, freeze and plug the lines, valve and injectors. To prevent this, engine
coolant is routed through the fuel pressure regulator to warm the fuel before it expands.
The regulator has an internal thermostat in its coolant bowl to control the flow of engine coolant. This prevents overheating and subsequent thinning of
the fuel which may cause lean combustion. Outlet coolant flow is restricted by the thermostat when it rises above approximately 82°C (100°F). If service
of the coolant bowl and/or thermostat is required, the coolant bowl and thermostat are serviced separately.
