•  When the pressure in the lower case decreases, fuel from the supply pump is introduced to the lower case.

•  The fuel feed valve is integrated with the lower case.

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•  The fuel feed valve consists of the spring, ball and filter.

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•  When the pressure in the lower case decreases to a certain value, the fuel from the supply pump flows into the lower case (on fuel injector side) by the ball pressing the spring.

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