Methods and systems are described for a fuel system in an engine comprising two lift pumps. One example method comprises deactivating one of a first lift pump and a second lift pump if fuel fill level in a common reservoir decreases below a threshold fill level, wherein the first lift pump and the second lift pump are positioned in the common reservoir. By deactivating one of the two lift pumps, the two lift pumps may be protected from degradation due to fuel starvation.

A fuel pump of a motor vehicle includes: a pump stage configured to induce fuel from a fuel tank; an electric motor configured to drive the pump stage; and control electronics configured to supply the electric motor with electrical current. The control electronics includes a memory storing a low temperature start program and a standard start program. The control electronics are connected to a temperature sensor and a selector configured to select the start program depending on the sensed temperature.

An alarm system is used for a vehicle including a fuel pump and an engine. The alarm system includes a measuring device, a computing device and a warning device. The measuring device is used to read a current rotation speed of the engine and respectively measures a plurality of running times of a plurality of rotation speed values of the current rotation speed. The computing device calculates a plurality of consuming times of the fuel pump corresponding to the rotation speed values according to the running times of the rotation speed values, respectively. When an accumulating consuming time accumulated by the consuming times reaches a default critical value, the warning device generates a warning message.

Methods and systems for evaluating whether or not a fuel amount that is greater than a threshold has been release to an engine via fuel injectors when the fuel injectors are commanded off are presented. In one example, an oxygen sensor is activated and engine cranking is prevented until a pumping current of the oxygen sensor is proportionate to a concentration of oxygen sensed via the oxygen sensor so that released fuel may be observed during engine starting.

A pump module is disposed on a bottom portion of a fuel tank in the fuel tank. The pump module includes a suck-up unit for sucking up a fuel and a plurality of engaged portions. A bracket includes a base portion, a plurality of engaging portions, and a flow path. The base portion is a frame member fixed to the bottom portion and surrounding the pump module in a state where a lower end portion is in contact with the bottom portion. The engaging portions protrude from the base portion toward an upper side of the fuel tank and are respectively engaged with the engaged portions of the pump module. The flow path is disposed in the base portion and allows an inside of a frame of the base portion and an outside of the frame of the base portion to communicate with each other.

Methods and systems for evaluating whether or not a fuel amount that is greater than a threshold has been release to an engine via fuel injectors when the fuel injectors are commanded off are presented. In one example, an oxygen sensor is activated and engine cranking is prevented until a pumping current of the oxygen sensor is proportionate to a concentration of oxygen sensed via the oxygen sensor so that released fuel may be observed during engine starting.

A vehicle traveling control method includes detecting a remaining fuel amount in a fuel tank including a fuel chamber in which a suction port of a fuel pump is disposed for sucking fuel to be supplied to an engine, the fuel tank being configured to generate negative pressure for sucking fuel to the fuel chamber by ejecting a part of fuel sucked by the fuel pump into the fuel chamber via a fuel line, permitting, when a predetermined condition is satisfied, inertial traveling during which a vehicle travels, with the engine kept stopped, operating, when the detected remaining fuel amount is less than a first threshold, the fuel pump despite the engine stopped owing to the inertial traveling, and prohibiting stop of the engine when the detected remaining fuel amount is less than a second threshold smaller than the first threshold.

A method and system for predicting the occurrence of a knock which will have a predetermined intensity or higher (intense knock) in an engine that burns an air-fuel mixture of gasoline fuel. The pressure in a combustion chamber is detected during an initial stage of combustion. This pressure is compared with a preset reference value to determine whether or not the cylinder inner pressure exceeds the reference value during the combustion. When the cylinder inner pressure exceeds the reference value, it is predicted that the intense knock will occur before an end of the combustion. If the intense knock is predicted, additional fuel or other material can be injected into the combustion chamber to prevent the occurrence of the intense knock.

Methods and systems for evaluating whether or not a fuel amount that is greater than a threshold has been release to an engine via fuel injectors when the fuel injectors are commanded off are presented. In one example, an oxygen sensor is activated and engine cranking is prevented until a pumping current of the oxygen sensor is proportionate to a concentration of oxygen sensed via the oxygen sensor so that released fuel may be observed during engine starting.

A transport refrigeration system having: a first engine (26) configured to power a refrigeration unit (22); a first fuel tank (330) fluidly connected to the first engine through a first fuel line (332); a first shut off valve (450) located within the first fuel line proximate the first fuel tank; a second shut off valve (72) located within the first fuel line proximate the first engine; a sensor system (80) configured to detect at least one of a crash of the transport refrigeration system, a fuel leak in the first fuel line, and an engine stall in the first engine; and a controller (30) configured to close the first shutoff valve and the second shutoff valve when the sensor system detects at least one of a crash of the transport refrigeration system, a fuel leak in the first fuel line, and an engine stall in the first engine.