VALVE GP-PUMP CONTROL 3133414 - Caterpillar

The Model Application Chart For ModelsDuring operation in cold temperature conditions, some customers have had fuel filter problems in areas where lighter grade fuels are not easily available. Heavier grade fuels have a higher "cloud point", which is the temperature where wax becomes solid particles in the fuel. When atmospheric temperatures are lower than the "cloud point" of the fuel, the solid particles of wax fill the fuel filters and stop the flow of fuel. To prevent this problem, fuel heaters are now available for field installation. The new fuel heaters use engine coolant to heat the fuel and prevent the development of solid wax particles.
Two different heater assemblies are used in the two new heater groups, as shown in the Group Components Chart. The 8N9455 Heater Assembly fits between the spin-on fuel filter and the filter base. Where a double filter is used, two heater groups are needed. The 8N9593 Heater Assembly is remotely mounted, and connected into the fuel supply line to the fuel filter. This heater can be used for applications where clearances do not permit use of a filter-mounted heater. For some applications, an optional installation is to use a remotely mounted fuel filter with a filter-mounted heater.
The new fuel heaters are adaptable to most Caterpillar products. For some installations, small changes and/or modifications are necessary. Special Instructions are available for installation, as shown in the Group Components Chart.
When a fuel heater is used, and atmospheric temperatures are below approximately 32°F (0°C), the recommendation is to start the engine and run it at low idle rpm until the coolant hoses to the heater become warm. This will keep the amount of wax in the fuel filter at a minimum.