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An engine incorporates a fuel injector to supply fuel to a combustion chamber defined in an engine body. At least one fuel rail defines a fuel passage through which fuel is supplied to the fuel injector. The fuel rail is mounted to the engine body. A fuel pump pressurizes the fuel. A sensor unit is

An engine incorporates a fuel injector to supply fuel to a combustion chamber defined in an engine body. At least one fuel rail defines a fuel passage through which fuel is supplied to the fuel injector. The fuel rail is mounted to the engine body. A fuel pump pressurizes the fuel. A sensor unit is elastically mounted to the fuel rail. The sensor unit has a fuel pressure sensor that detects a pressure of the fuel pressurized by the fuel pump. The engine body has bosses that project therefrom. The engine body defines bolt holes that extend through the bosses and into the engine body adjacent to the bosses. A threaded section is formed in each bolt hole in the engine body adjacent to the corresponding boss. A bolt is screwed down into each threaded section. A portion of each bolt is spaced apart from an inner surface of a corresponding bolt hole to reduce the effects of thermal expansion of the engine body and the fuel rail.

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1. An internal combustion engine comprising an engine body defining a cylinder bore, a movable member movable within the cylinder bore, the engine body and the movable member together defining a combustion chamber, a fuel injector to supply fuel to the combustion chamber for combustion therein, a fu

1. An internal combustion engine comprising an engine body defining a cylinder bore, a movable member movable within the cylinder bore, the engine body and the movable member together defining a combustion chamber, a fuel injector to supply fuel to the combustion chamber for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injector, the fuel rail being mounted to the engine body, a fuel pump pressurizing the fuel, and a sensor unit elastically mounted to the fuel rail, the sensor unit comprising a fuel pressure sensor that detects a pressure of the fuel pressurized by the fuel pump.2. The engine as set forth in claim 1, additionally comprising an elastic member, the sensor unit being mounted to the fuel rail such that the elastic member is interposed between the sensor unit and the fuel rail.3. The engine as set forth in claim 2, wherein the sensor unit further comprises a pressure receiver, and the pressure receiver is coupled with the fuel pressure sensor.4. The engine as set forth in claim 3, additionally comprising a second fuel conduit, the second fuel conduit connecting the pressure receiver with the first fuel rail.5. The engine as set forth in claim 2, additionally comprising a support member supporting the sensor unit, the support member being interposed between the fuel rail and the sensor unit, and the support member being mounted to the fuel rail.6. The engine as set forth in claim 5, wherein the elastic member is interposed between the support member and the fuel rail.7. The engine as set forth in claim 6, wherein the support member is affixed to the fuel rail via the elastic member, and the sensor unit is affixed to the support member.8. The engine as set forth in claim 5, wherein the elastic member is interposed between the support member and the sensor unit.9. The engine as set forth in claim 8, wherein the support member is rigidly affixed to the fuel rail, and the sensor unit is affixed to the support member via the elastic member.10. The engine as set forth in claim 5, wherein the sensor unit is spaced apart from an outer surface of the fuel rail.11. The engine as set forth in claim 5, wherein the support member is a sheet of metal forming a mount section and a support section, the mount section is affixed to the fuel rail, and the support section is supporting the sensor unit.12. The engine as set forth in claim 5, wherein the support member is a bolt.13. The engine as set forth in claim 1, wherein the fuel rail is made of a metal material and is rigidly affixed to the engine body.14. The engine as set forth in claim 1, wherein the engine body has a boss projecting therefrom, the fuel rail is affixed to the boss by a bolt, a bolt hole is defined to extend through the boss and into the engine body adjacent to the boss, the bolt hole has a threaded section at least in the engine body adjacent to the boss, and the bolt is screwed down into the threaded section of the bolt hole.15. The engine as set forth in claim 14, wherein a portion of the bolt is spaced apart from an inner surface of the bolt hole.16. The engine as set forth in claim 1, wherein the fuel injector is mounted to the fuel rail.17. The engine as set forth in claim 1, wherein the fuel injector is disposed to spray fuel directly into the combustion chamber.18. A marine drive comprising a propulsion device and an internal combustion engine powering the propulsion device, the engine comprising an engine body defining a cylinder bore, a movable member movable within the cylinder bore, the engine body and the movable member together defining a combustion chamber, a fuel injector to supply fuel to the combustion chamber for combustion therein, a fuel conduit defining a fuel passage through which fuel is supplied to the fuel injector, the fuel conduit being mounted to the engine body, a fuel pump pressurizing the fuel, and a sensor unit elastically mounted to the fuel conduit, the sensor unit comprising a fuel pressure sensor that detects a pressure of the fuel pressurized by the fuel pump.19. An internal combustion engine comprising an engine body defining a cylinder bore, a movable member movable within the cylinder bore, the engine body and the movable member together defining a combustion chamber, a fuel injector to supply fuel to the combustion chamber for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injector, the engine body having a boss projecting therefrom, a bolt hole being defined to extend through the boss and into the engine body adjacent to the boss, the bolt hole having a threaded section at least in the engine body adjacent to the boss, and a bolt being screwed down into the threaded section, a collar being inserted into a space defined between the bolt and the inner surface of the bolt hole.20. The engine as set forth in claim 19, wherein the boss is formed together with the engine body in a unitary structure.21. The engine as set forth in claim 19, wherein at least a part of the boss is formed separately from the engine body and is coupled with the engine body.22. The engine as set forth in claim 19, wherein a portion of the bolt is spaced apart from an inner surface of the bolt hole.23. An internal combustion engine comprising an engine body defining a cylinder bore, a movable member movable within the cylinder bore, the engine body and the movable member together defining a combustion chamber, a fuel injector to supply fuel to the combustion chamber for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injector, the engine body having a boss projecting therefrom, a bolt hole being defined to extend at least into the boss, at least a part of the bolt hole having a threaded section, and a bolt being screwed down into the threaded section, at least a portion of the bolt being spaced apart from an inner surface of the bolt hole, and a collar inserted into a space defined between the bolt and the inner surface of the bolt hole.24. The engine as set forth in claim 23, wherein the boss and the engine body define the bolt hole.25. An internal combustion engine comprising an engine body defining a plurality of cylinder bores, movable members movable within the respective cylinder bores, the engine body and the movable members together defining a plurality of combustion chambers, a plurality of fuel injectors to supply fuel to the respective combustion chambers for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injectors, the fuel rail being affixed to the engine body by at least first, second and third fastening mechanisms that are spaced apart from each other along a longitudinal axis of the fuel rail, the third mechanism being interposed between the first and second mechanisms, a magnitude of strength for the first and second mechanisms being greater than a magnitude of strength for the third mechanism.26. An internal combustion engine comprising an engine body defining a plurality of cylinder bores, movable members movable within the respective cylinder bores, the engine body and the movable members together defining a plurality of combustion chambers, a plurality of fuel injectors to supply fuel to the respective combustion chambers for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injectors, the engine body having first, second and third bosses extending therefrom, first and second bolt holes being defined to extend through the first and second bosses and into the engine body adjacent to the first and second bosses, a third bolt hole being defined to extend into the third boss and not into the engine body adjacent to the third boss, each one of the first and second bolt holes having a threaded section in the engine body adjacent to the first and second bosses, the third bolt hole having a threaded section in the third boss, and a plurality of bolts being screwed down into the respective threaded sections.27. The engine as set forth in claim 26, wherein the first and second bosses are thicker than the third boss is.28. The engine as set forth in claim 26, wherein the third boss is interposed between the first and second bosses.29. The engine as set forth in claim 26, wherein at least a portion of each of the bolts is spaced apart from an inner surface of the corresponding bolt hole.30. The engine as set forth in claim 29, wherein a collar is inserted into at least either the first or second bolt hole.31. An internal combustion engine comprising an engine body defining a plurality of cylinder bores, movable members movable within the respective cylinder bores, the engine body and the movable members together defining a plurality of combustion chambers, a plurality of fuel injectors to supply fuel to the respective combustion chambers for combustion therein, a fuel rail defining a fuel passage through which fuel is supplied to the fuel injectors, the engine body having first, second and third bosses extending therefrom, the first and second bosses being thicker than the third boss, first, second and third bolt holes being defined to extend at least into the first, second and third bosses, respectively, a threaded section being formed in each one of the bolt holes, and a plurality of bolts being screwed down into the respective threaded sections.32. The engine a set forth in claim 1 additionally comprising an elastic member elastically mounting the sensor unit to the fuel rail and being disposed between and contacting both the sensor unit and the fuel rail, the elastic member being configured to attenuate vibrations from the fuel rail.33. The marine drive as set forth in claim 18 additionally comprising an elastic member elastically mounting the sensor unit to the fuel conduit and being disposed between and contacting both the sensor unit and the fuel conduit, the elastic member being configured to attenuate vibrations from the fuel conduit.34. The marine drive as set forth in claim 33, wherein the fuel conduit is a fuel rail.