Impreza WRX F4-2.0L DOHC Turbo (2004)
Fuel Boost Pump / Fuel Transfer Pump: Description and Operation
JET PUMP
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The jet pump utilizes the velocity of fuel returning from the engine to produce negative pressure in it.
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Using the pumping effect produced by the negative pressure, the jet pump transfers fuel from the sub-compartment to the main compartment of the
fuel tank.
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When the return line nozzle is clogged, the fuel sent back through the return line flows back into the fuel tank via the relief valve.
