Various methods and systems are provided for health assessments of a fuel system. In one example, a fuel system includes a high-pressure fuel pump operable to increase fuel pressure from a first pressure to a second pressure, a common fuel rail fluidly coupling the high-pressure fuel pump to a plurality of fuel injectors each of which is operable to inject fuel to individual cylinders of an engine, a pressure sensor operable to detect a pressure of fuel at the common fuel rail, and a controller operable to diagnose a condition of the high-pressure fuel pump based on output from the pressure sensor.

Various methods and systems are provided for health assessments of a fuel system. In one example, a fuel system includes a high-pressure fuel pump operable to increase fuel pressure from a first pressure to a second pressure, a common fuel rail fluidly coupling the high-pressure fuel pump to a plurality of fuel injectors each of which is operable to inject fuel to individual cylinders of an engine, a pressure sensor operable to detect a pressure of fuel at the common fuel rail, and a controller operable to diagnose a condition of the high-pressure fuel pump based on output from the pressure sensor.

Methods and apparatus to automatically control oil burning operations are disclosed. An example apparatus includes a first control valve to control a flow of a first fluid into a fluid mixture to be burned; and a second control valve to control a flow of a second fluid into the fluid mixture. The example apparatus further includes a meter to monitor a property of the fluid mixture in substantially realtime, the property indicative of a flammability of the fluid mixture, at least one of the first control valve or the second control valve to be automatically adjusted based on a measured value of the property of the fluid mixture

Methods and apparatus to automatically control oil burning operations are disclosed. An example apparatus includes a first control valve to control a flow of a first fluid into a fluid mixture to be burned; and a second control valve to control a flow of a second fluid into the fluid mixture. The example apparatus further includes a meter to monitor a property of the fluid mixture in substantially realtime, the property indicative of a flammability of the fluid mixture, at least one of the first control valve or the second control valve to be automatically adjusted based on a measured value of the property of the fluid mixture

A mobile heating device, comprising a heater assembly including a fuel chamber, and a fuel supply line for supplying liquid fuel to the heater assembly, where the heater assembly further includes an evaporator receiving arrangement for evaporating liquid fuel, said arrangement comprising an evaporator receiving body for receiving an evaporator element for distributing and evaporating liquid fuel, where the fuel supply line comprises a supply pipe with an inlet for inputting fuel and an outlet for outputting fuel to the combustion chamber, where the fuel supply line further includes an emptying device for partly or completely emptying the fuel supply line through the outlet.

A mobile heating device, comprising a heater assembly including a fuel chamber, and a fuel supply line for supplying liquid fuel to the heater assembly, where the heater assembly further includes an evaporator receiving arrangement for evaporating liquid fuel, said arrangement comprising an evaporator receiving body for receiving an evaporator element for distributing and evaporating liquid fuel, where the fuel supply line comprises a supply pipe with an inlet for inputting fuel and an outlet for outputting fuel to the combustion chamber, where the fuel supply line further includes an emptying device for partly or completely emptying the fuel supply line through the outlet.

A fuel delivery system for a gas turbine engine that employs a technique for purging fuel delivery tubes in an effective manner. The fuel delivery system includes at least one multifunction valve that has a flow through position and a bi-directional purge position. The fuel delivery system also includes at least one flow divider that is positioned downstream from the multifunction valve and divides the flow of fuel from the valve into a number of the fuel delivery tubes, where a separate fuel delivery tube is provided for each combustor in the engine. The flow divider includes a pump element for all of the fuel delivery tubes that can operate in a forward and a reverse direction. Purge water provided downstream from the flow divider for each of the fuel delivery tubes can be pumped by the flow divider when the multifunction valve is in the purge position.

A fuel delivery system for a gas turbine engine that employs a technique for purging fuel delivery tubes in an effective manner. The fuel delivery system includes at least one multifunction valve that has a flow through position and a bi-directional purge position. The fuel delivery system also includes at least one flow divider that is positioned downstream from the multifunction valve and divides the flow of fuel from the valve into a number of the fuel delivery tubes, where a separate fuel delivery tube is provided for each combustor in the engine. The flow divider includes a pump element for all of the fuel delivery tubes that can operate in a forward and a reverse direction. Purge water provided downstream from the flow divider for each of the fuel delivery tubes can be pumped by the flow divider when the multifunction valve is in the purge position.

A heating device operating with liquid fuel in the single-line mode includes a fuel pump which draws fuel from a supply tank and delivers it into a pressure line region communicating with an atomiser nozzle opening into a combustion chamber, wherein excess fuel is returned from the pressure region to the suction side of the fuel pump by way of a pressure regulator, a return line and a bypass line. Arranged between the return line and the bypass line is a venting apparatus including an actuating element which is reciprocable between an operating position and a venting position and which in the operating position connects the return line to the bypass line to reliably seal the medium in the lines towards the exterior and in the venting position connects the return line to the exterior of the heating device and in that case closes the bypass line.

A heating device operating with liquid fuel in the single-line mode includes a fuel pump which draws fuel from a supply tank and delivers it into a pressure line region communicating with an atomiser nozzle opening into a combustion chamber, wherein excess fuel is returned from the pressure region to the suction side of the fuel pump by way of a pressure regulator, a return line and a bypass line. Arranged between the return line and the bypass line is a venting apparatus including an actuating element which is reciprocable between an operating position and a venting position and which in the operating position connects the return line to the bypass line to reliably seal the medium in the lines towards the exterior and in the venting position connects the return line to the exterior of the heating device and in that case closes the bypass line.