Fuel Pump
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The fuel pump is an electric piston pump that doses the right amount of fuel to the heater. The fuel pump power supply is connected to the control module and grounded to the grounding point. By pulsing the feed with a varying frequency, the control module can determine the amount of fuel delivered for combustion.
The fuel pump is located at the fuel tank, connected without filter to a separately prepared tank connection.
There are diagnostics for the electronics of the fuel pump.