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Systems and methods for determining a plurality of characteristics of a fuel and controlling a fuel delivery system based on the characteristics of the fuel. A controller generates a plurality of control signals. The control signals are transmitted to at least one ultrasonic transducer, a capacitanc

Systems and methods for determining a plurality of characteristics of a fuel and controlling a fuel delivery system based on the characteristics of the fuel. A controller generates a plurality of control signals. The control signals are transmitted to at least one ultrasonic transducer, a capacitance sensor, and a temperature sensor. Each of the ultrasonic transducer, capacitance sensor, and temperature sensor generate at least one output signal which is transmitted back to the controller. The controller determines, based on the output signals, the plurality of characteristics of the fuel. The characteristics of the fuel can include, for example, temperature, density, dielectric constant, and the like. The controller then compares the characteristics of the fuel to a set of characteristics of a first fuel type and a second fuel type and controls a fuel delivery device based on the characteristics of the fuel.

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What is claimed is: 1. A system for delivering a fuel to an internal-combustion engine based on one or more characteristics of a fuel in a tank, the system comprising: a first ultrasonic transducer configured to generate an output; a temperature sensor configured to generate an output; and a contro

What is claimed is: 1. A system for delivering a fuel to an internal-combustion engine based on one or more characteristics of a fuel in a tank, the system comprising: a first ultrasonic transducer configured to generate an output; a temperature sensor configured to generate an output; and a controller configured to generate a plurality of control signals, send at least one of the plurality of control signals to the first ultrasonic transducer, receive the output of the first ultrasonic transducer, receive the output of the temperature sensor, determine one or more characteristics of the fuel based on the output of the first ultrasonic sensor and the output of the temperature sensor, compare the one or more characteristics of the fuel to a set of characteristics of a first fuel type and a second fuel type, and send a control signal to a fuel delivery device if at least one of the one or more characteristics fall outside a predetermined set of boundary conditions. 2. The system of claim 1, wherein the first fuel type is gasoline and the second fuel type is diesel. 3. The system of claim 1, further comprising a capacitance sensor configured to generate an output, and wherein the controller is configured to receive the output of the capacitance sensor and determine one or more characteristics of the fuel based on the output of the first ultrasonic sensor, the output of the temperature sensor, and the output of the capacitance sensor. 4. The system of claim 3, wherein the controller is configured to calculate a dielectric constant for the fuel based on the output of the capacitance sensor. 5. The system of claim 1, wherein the controller is further configured to determine a fuel level in the tank based on the output of the first ultrasonic sensor. 6. The system of claim 1, wherein the set of characteristics of the fuel include a fuel quality. 7. The system of claim 1, wherein the set of characteristics of the fuel include a fuel type. 8. The system of claim 1, wherein the first ultrasonic transducer and the temperature sensor are configured to be located in the fuel tank and immersed in the fuel. 9. The system of claim 8, wherein the controller is configured to be located in the fuel tank and immersed in the fuel. 10. The system of claim 1, further comprising a second ultrasonic transducer; and a reference target positioned a first distance from the first ultrasonic transducer and a second distance from the second ultrasonic transducer. 11. The system of claim 10, wherein the controller is configured to switch between a first operating mode and a second operating mode, wherein the first operating mode includes sending a first control signal to the first ultrasonic transducer to generate a first signal and receiving a second signal from the second ultrasonic transducer based on a reflection of the first signal from a surface of the fuel in the tank, and wherein the second operating mode includes sending a second control signal to the second ultrasonic transducer to generate a third signal and receiving a fourth signal from the first ultrasonic transducer based on a reflection of the third signal from the reference target. 12. The system of claim 11, wherein the controller is configured to determine a distance to the surface based on at least one of the second signal or the fourth signal. 13. A method of delivering a fuel to an engine based on one or more characteristics of the fuel in a tank, the method comprising: configuring a controller to generate a plurality of control signals; transmitting a first control signal to a first ultrasonic transducer; transmitting an output of the first ultrasonic transducer to the controller in response to the first control signal; transmitting an output of a capacitance sensor to the controller; transmitting an output of a temperature sensor to the controller; determining a set of characteristics of the fuel based on the output of the ultrasonic sensor, the output of the temperature sensor, and the output of the capacitance sensor; comparing the set of characteristics of the fuel to a set of characteristics of a first fuel type and a set of characteristics of a second fuel type; and controlling a fuel delivery device based on the characteristics of the fuel. 14. The method of claim 13, further comprising configuring the controller to determine a fuel level in the tank based on the output of the first ultrasonic sensor. 15. The method of claim 13, wherein determining a set of characteristics of the fuel includes determining a fuel quality. 16. The method of claim 13, wherein determining a set of characteristics of the fuel includes determining a fuel type. 17. The method of claim 13, further comprising submerging the first ultrasonic transducer, the capacitance sensor, and the temperature sensor in the fuel. 18. The method of claim 13, further comprising submerging the controller in the fuel. 19. The method of claim 13, further comprising configuring the controller to send a signal to disable the fuel delivery device when the fuel does not satisfy a set of predetermined boundary conditions. 20. The method of claim 13, further comprising positioning a reference target a first distance from the first ultrasonic transducer and a second distance from a second ultrasonic transducer. 21. The method of claim 20, further comprising switching the controller between a first operating mode and a second operating mode, wherein the first operating mode includes sending a first control signal to the first ultrasonic transducer to generate a first signal and receiving a second signal from the second ultrasonic transducer based on a reflection of the first signal from a surface, and wherein the second operating mode includes sending a second control signal to the second ultrasonic transducer to generate a third signal and receiving a fourth signal from the first ultrasonic transducer based on a reflection of the third signal from the reference target. 22. The method of claim 21, further comprising configuring the controller to determine a distance to the surface based on at least one of the second signal or the fourth signal. 23. The method of claim 13, further comprising calculating a dielectric constant for the fuel based on the output of the capacitance sensor. 24. The method of claim 13, further comprising determining a temperature of the fuel based on the output of the temperature sensor. 25. A method of delivering a fuel to an engine based on one or more characteristics of the fuel in a tank, the method comprising: configuring a controller to generate a plurality of control signals; transmitting the control signals to a first ultrasonic transducer, a capacitance sensor, and a temperature sensor; receiving a plurality of output signals from the first ultrasonic transducer, capacitance sensor, and temperature sensor in response to the control signals; determining a set of characteristics of the fuel based on the plurality of output signals; altering the delivery of the fuel to the engine based on the set of characteristics of the fuel; and disabling a fuel delivery system when the fuel does not satisfy a set of predetermined boundary conditions. 26. The method of claim 25, further comprising configuring the controller to determine a fuel level in the tank based on the plurality of output signals. 27. The method of claim 25, wherein determining a set of characteristics of the fuel includes determining a fuel quality. 28. The method of claim 25, wherein determining a set of characteristics of the fuel includes determining a fuel type. 29. The method of claim 25, further comprising submerging the first ultrasonic transducer, the capacitance sensor, and the temperature sensor in the fuel. 30. The method of claim 25, further comprising submerging the controller in the fuel. 31. The method of claim 25, further comprising positioning a reference target a first distance from the first ultrasonic transducer and a second distance from a second ultrasonic transducer. 32. The method of claim 31, further comprising switching the controller between a first operating mode and a second operating mode, wherein the first operating mode includes sending a first control signal to the first ultrasonic transducer to generate a first signal and receiving a second signal from the second ultrasonic transducer based on a reflection of the first signal from a surface of the fuel in the tank, and wherein the second operating mode includes sending a second control signal to the second ultrasonic transducer to generate a third signal and receiving a fourth signal from the first ultrasonic transducer based on a reflection of the third signal from the reference target. 33. The method of claim 32, further comprising configuring the controller to determine a distance to the surface based on at least one of the second signal or the fourth signal. 34. The method of claim 25, further comprising calculating a dielectric constant for the fuel based on the plurality of output signals including a measured capacitance. 35. The method of claim 25, further comprising determining a temperature of the fuel based on the plurality of output signals.