Vehicle fuel feeding and evaporation system

Abstract

The invention discloses a vehicle fuel feeding and evaporation system. The vehicle fuel feeding and evaporation system comprises a fuel tank, a fuel pump assembly, a fuel filter, a fuel feeding pipe, a fuel feeding and air ventilating pipe and a carbon tank; and the fuel tank is connected with the carbon tank through an evaporation pipe, and the output of the carbon tank is connected with and engine through a carbon tank absorption pipe. A check valve is arranged on the evaporation pipe for connecting the fuel tank with the carbon tank; and by means of the check valve, the carbon tank and the fuel tank are through in the direction from the carbon tank to the fuel tank, and the carbon tank and the fuel tank are through in the direction from the fuel tank to the carbon tank at a set pressure, wherein the set pressure is larger than the fuel pressure at a fuel feeding opening of the fuel feeding pipe and the lower end of the fuel feeding pipe when fuel feeding pipe is filled with fuel. By means of the vehicle fuel feeding and evaporation system, continuity of fuel injecting after gun closing can be prevented, and the problems that the carbon tank is prone to losing efficiency and the fuel steam is prone to volatizing to the atmosphere due to the fact that liquid fuel in the fuel tank flows into the carbon tank can be solved. The vehicle fuel feeding and evaporation system is low in cost, modifications of an original pope structure are fewer, and convenience is brought to after-market refitting.

Description

technical field [0001] The invention relates to an automobile fuel system, specifically a vehicle fuel supply and evaporation system controlled by a valve system, which is used to prevent excessive fuel filling or liquid fuel in the fuel tank from flowing into the carbon tank through the evaporation pipeline and cause the carbon tank to fail, belonging to the automobile fuel oil system. Supply and fuel evaporation technology field. Background technique [0002] Due to the possibility of fuel evaporation, in order to prevent the fuel in the fuel tank from evaporating into the atmosphere and polluting the air, a carbon canister is installed in the fuel system of the vehicle. The carbon canister is equipped with activated carbon. The carbon canister is connected to the fuel tank through a pipeline, so that the fuel tank produces The steam can enter the carbon tank through the pipeline and be absorbed by the activated carbon. A carbon canister adsorption pipe is arranged betw...

AI Technical Summary

Problems solved by technology

If you continue to refill after jumping the gun, the fuel in the fuel tank will be too full, and there will be insufficient space for the volatilization of oil and gas, and even the liquid fuel will directly flow back into the carbon tank, resulting in the failure of the carbon tank, posing a great safety hazard

[0006] 2. The fuel tank is directly connected to the carbon tank through the fuel evaporation pipeline. When the vehicle is not used for a long time or exposed to the sun for a long time, the fuel vapor in the fuel tank will quickly cause the activated carbon in the carbon tank to absorb and saturate until it fails (the engine will not work if the car is not used for a long time. It cannot absorb the fuel vapor from the carbon tank into the engine for combustion)

If the user fails to replace the carbon tank in time, it may also cause liquid fuel to overflow from the carbon tank to the engine room, causing serious safety hazards

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