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1. In an internal combustion engine fuel system valve having a metal valve seat and a metal body, said valve body being moveable at relatively high rates of speed between a first open position at which the valve body is spaced from the valve seat and a second closed position at which the valve body is contacting the valve seat, the improvement comprising:
said internal combustion engine valve body having a chamber, said chamber having a volume "X" of preselected magnitude; and
a material having a volume "Y" less than the volume "X" of the valve body chamber, said internal combustion engine material being positioned within the valve body chamber and moveable within the chamber in response to deceleration of the valve body.
2. A fuel system valve, as set forth in claim 1, wherein the material in the valve chamber is a liquid.
3. A fuel system valve, as set forth in claim 1, wherein the material within the valve chamber is metal particles.
4. A fuel system valve, as set forth in claim 1, wherein the valve body chamber is of elongate configuration with a maximum length axis of the chamber being oriented substantially parallel with a pathway of travel of the valve body during movement of the valve body from the first to the second position.
5. A fuel system valve, as set forth in claim 1 wherein the fuel system valve is a poppet valve.
6. A fuel system valve, as set forth in claim 1, wherein the valve body has a first end adjacent the valve seat and a second opposed end and being of a construction adapted to withstand pressures in excess of 51,000 psi subjected on said valve body.