Abstract: An engine control system having primary and secondary fuel tanks comprises a fuel monitoring module and a transfer pump (TP) diagnostic module. The fuel monitoring module determines a measured fuel level of the secondary fuel tank based on a fuel level signal received from a fuel level sensor when a fuel TP is on for greater than a predetermined time period required for the fuel TP to reduce the measured fuel level from a predetermined fuel level to below the predetermined fuel level. The TP diagnostic module diagnoses a condition of the fuel TP based on the measured fuel level.

Abstract: A control system comprising a detection module that detects at least one of a vehicle speed and an engine speed and a canister vent valve control module that selectively modulates the canister vent valve based on at least one of the vehicle speed and the engine speed. A method comprising detecting at least one of a vehicle speed and an engine speed and selectively modulating a canister vent valve based on at least one of the vehicle speed and the engine speed.

Abstract: A diagnostic system and method includes a fuel level sensor that senses a fuel level in a fuel tank and a sensor diagnostic module that monitors a fuel transfer mechanism for a time period, that calculates a change in the fuel level, and that evaluates operation of the first fuel level sensor based on the change and the predetermined period.

Abstract: A diagnostic system and method for detecting failures in a fuel system of a vehicle includes a fuel level monitoring module that determines a first change in a first fuel level of a first fuel tank based on data received from a first fuel level sensor and determines a second change in a second fuel level of a second fuel tank based on data received from a second fuel level sensor. A sensor diagnosing module evaluates operation of the second fuel level sensor based on the first change in the first fuel level.

Abstract: A control system comprising a detection module that detects at least one of a vehicle speed and an engine speed and a canister vent valve control module that selectively modulates the canister vent valve based on at least one of the vehicle speed and the engine speed. A method comprising detecting at least one of a vehicle speed and an engine speed and selectively modulating a canister vent valve based on at least one of the vehicle speed and the engine speed.

Abstract: A fuel level monitoring system for a fuel system having a primary fuel tank and a secondary fuel tank includes a fuel level sensor that is disposed within the secondary fuel tank and that generates a first signal. An empty switch is disposed within the secondary fuel tank and generates a second signal. A control module determines a condition of one of the fuel level sensor and the empty switch based on the first signal, the second signal and a plurality of signal thresholds.

Abstract: An engine control system having primary and secondary fuel tanks comprises a fuel monitoring module and a transfer pump (TP) diagnostic module. The fuel monitoring module determines a measured fuel level of the secondary fuel tank based on a fuel level signal received from a fuel level sensor when a fuel TP is on for greater than a predetermined time period required for the fuel TP to reduce the measured fuel level from a predetermined fuel level to below the predetermined fuel level. The TP diagnostic module diagnoses a condition of the fuel TP based on the measured fuel level.

Abstract: A diagnostic system and method for detecting failures in a fuel system of a vehicle includes a fuel level monitoring module that determines a first change in a first fuel level of a first fuel tank based on data received from a first fuel level sensor and determines a second change in a second fuel level of a second fuel tank based on data received from a second fuel level sensor. A sensor diagnosing module evaluates operation of the second fuel level sensor based on the first change in the first fuel level.

Abstract: A diagnostic system and method includes a fuel level sensor that senses a fuel level in a fuel tank and a sensor diagnostic module that monitors a fuel transfer mechanism for a time period, that calculates a change in the fuel level, and that evaluates operation of the first fuel level sensor based on the change and the predetermined period.

Abstract: A fuel level monitoring system for a fuel system having a primary fuel tank and a secondary fuel tank includes a fuel level sensor that is disposed within the secondary fuel tank and that generates a first signal. An empty switch is disposed within the secondary fuel tank and generates a second signal. A control module determines a condition of one of the fuel level sensor and the empty switch based on the first signal, the second signal and a plurality of signal thresholds.

Abstract: A vehicle, such as a truck, includes mixing and pumping equipment for mixing a liquid and a particulate material (e.g., cement) and for pumping the mixture. One application is to pump the mixture into a wellbore for cementing a casing or liner to the wellbore inner wall. The vehicle includes a cab, with the mixing and pumping equipment positioned behind the cab. The equipment includes one or more reservoirs, with at least one used as both a mixing and displacement tank. A hose assembly is also positioned on the vehicle. To reduce the weight load placed on the rear axle(s) of the vehicle, relatively heavy components, such as the pump, are placed further forward on the truck. In one arrangement, the pump may be placed between the cab and the one or more reservoirs.