Fuel pressure regulator

A fuel pressure regulator for regulating fuel pressure in a fuel system, said fuel pressure regulator comprising:

• a housing having a housing bore which extends along a housing bore axis, said housing also having a housing inlet which allows fuel into said housing bore;
• a piston located within said housing bore such that said piston and said housing bore define an accumulation chamber and such that said piston slides along said housing bore axis between 1) a first piston position in which said accumulation chamber is minimized in volume and 2) a second piston position in which said accumulation chamber is maximized in volume, said piston having a piston bore extending therethrough from a piston inlet to a piston outlet such that a valve seat is defined between said piston inlet and said piston outlet, such that said piston inlet allows fuel into said piston bore from said housing inlet, and such that said piston outlet provides a path out of said fuel pressure regulator from said piston bore;
• a piston spring which biases said piston toward said first piston position;
• a valve closure within said piston bore which moves between 1) a seated position such that said valve closure mates with said valve seat, thereby preventing fluid communication from said piston inlet to said piston outlet and 2) an unseated position such that said valve closure is separated from said valve seat, thereby providing fluid communication from said piston inlet to said piston outlet;
• and
• a valve closure spring which biases said valve closure toward said seated position.