What is the purpose of a fuel heater in a marine engine start system?

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The fuel heater is used to raise the temperature of the fuel so its viscosity drops. In cold conditions, fuel can become thick and flow slowly through lines, filters, and the pump, which can make starting unreliable or cause fuel starvation. By warming the fuel, the pump and fuel paths flow more easily, ensuring a steady supply to the injector during start. This is different from warming the air intake, which aids combustion in a different way. The heater’s job isn’t to vaporize the fuel; atomization happens at the injector under high pressure. So the main purpose is to reduce viscosity and improve reliable fuel flow for a good start.