| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel sensor capable of improving detection accuracy.SOLUTION: An outside electrode 30 comprises: an outside insert part 31 inserted into a resin body 10; and an outside immersion part 32 protruding into a fuel passage from the resin body 10. An inside electrode 40 provided on an inner diameter side of the outside electrode 30 comprises: an inside insert part 41 inserted into the resin body 10; an inside immersion part 42 protruding into the fuel passage from the resin body 10; and a protrusion 43 protruding to the side opposite to the fuel passage 2 from the resin body 10. Detection means 51 detects alcohol concentration in fuel on the basis of capacitance between the electrodes. A first O-ring 61 fluid-tightly contacts an outside wall of the protrusion 43 of the inside electrode 40 and the resin body 10. Thereby, the detection circuit 51 can accurately detects the capacitance between the electrodes even when the first O-ring 61 causes positional deviation in an axial direction of the inside electrode 40. |
