Importance

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Abstract

A piston assembly for a fuel pump comprises a first piston sub-assembly and a second piston sub-assembly. The first piston sub-assembly comprises a first piston portion, a first check ball connected to a first spring and a first O-ring. The first check ball forms a fluid tight seal against the first piston portion when the first spring is uncompressed. The first check ball allows fluid flow relative to the first piston portion when the first spring is compressed. The first O-ring has a front side and a back side. The first O-ring forms a fluid tight seal relative to the first piston portion. The second piston sub-assembly comprises a second piston portion, a second check ball connected to a second spring, and a second O-ring. The second check ball forms a fluid tight seal against the second piston portion when the second spring is uncompressed. The second check ball allows fluid flow relative to the second piston portion when the second spring is compressed. The second O-ring has a front side and a back side. The second O-ring forms a fluid tight seal relative to the second piston portion. The fluid flow relative to the first piston portion allows fluid to contact the front side of the second O-ring and the back side of the first O-ring.

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First Claim