Fuel injection system diagnostic system

An internal combustion engine diagnostic sensor system comprising in combination:

• a fuel rail for said engine, said fuel rail having a high pressure inlet end, a plurality of injector ports and a terminating end;
• a connecting means disposed at the high pressure inlet end of the fuel rail, said connecting means having a near end that is openly connected to the fuel rail, and a distal end that has mounted thereon, a valve and surmounted on the valve, a piezoelectric sensor, said piezoelectric sensor being in open communication with the fuel rail through the valve,
• wherein the diagnostic sensor is a device comprising:
• a. an insertable component comprising a housing having a front and a back, said back having centered therein a closed hub having a wall, said closed hub being integrally connected to and surmounted on an annular flange;
• said flange being integrally connected to and surmounted on an open hub, said open hub having a wall defining an interior void space, a front, an external surface, a shouldered seat in the wall at the open hub front thereof, and a bottom in the interior void space, said open hub having threads on the external surface and having an opening from the bottom of the void space and through a portion of the closed hub to form an elongated cavity on the interior of the closed hub, said closed hub having at least two second openings leading from the cavity through the closed hub wall and exiting to the outside of the closed hub, there being located in each such second opening, an electrical lead, each said electrical lead having an external end and an internal end, wherein each external end terminates upon exiting the closed hub through one of the second openings, the internal end passing into the elongated cavity and connecting electrically to a wire lead, each wire lead passing through the elongated cavity, through the void space, and connecting electrically to:
• b. a piezoelectric diaphragm, which diaphragm is seated in the shouldered seat in the wall;
• c. a noise reduction circuit, said noise reduction circuit being connected to and between each of the wire leads at or near the points of connection of the wire leads to the piezoelectric diaphragm;
• d. a modulator disc, said modulator disc overlaying the piezoelectric diaphragm and having a diameter equal to or greater than the diameter of the piezoelectric diaphragm;
• e. a receiving component, said receiving component comprising a housing having a front, a back, a side wall defining an interior void space, said side wall threaded on the interior surface, said interior void space having a bottom, which bottom has a saucer-like concave configuration, and, centered in the saucer-like concave configuration, an elongated opening, which elongated opening passes from the saucer-like concave configuration, through the receiving housing, and exiting to the exterior of the receiving component.