FIELD OF INVENTION
This invention relates to an improved automobile fuel system for elimination of vapor lock. The fuel system comprises of fuel tank, fuel pump with hoses and pipes to take the fuel from tank to engine.
BACKGROUND/PRIOR ART
Fuel system of LPG vehicle is provided with a solenoid between mechanical Fuel pump and carburator. The solenoid is open when vehicle is in gasoline mode so that gasoline can reach engine. In LPG mode the solenoid closes to stop supply of gasoline to the engine and start LPG supply. In LPG mode the Mechanical Fuel pump works, but with no circulation of Gasoline wherein the same fuel is stuck. Due to heat of engine and continuous working of the fuel pump, the gasoline in fuel pump evaporates.
In case, gasoline mode is switched over, the vehicle does not start as there is vapor in fuel circuit, therefore fuel can not reach the carburator. This problem is due to Vapor lock caused near fuel pump.
OBJECTIVES OF THE INVENTION
An object of the present invention is to provide an improved automobile fuel system for elimination of vapor lock, which overcomes disadvantage(s) associated with the prior art.
Another object of the present invention is to provide an improved automobile fuel system for elimination of vapor lock, which is simple in construction.

Further object of the present invention is to provide an improved automobile fuel system for elimination of vapor lock, which is efficient.
STATEMENT OF INVENTION
According to this invention, there is provided an improved automobile fuel system for elimination of vapor lock comprising of a return bypass circuit in the fuel pump, which allows circulation of fuel in LPG mode and a non return valve for the recirculation.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawing and wherein:
Fig. 1 shows: circuit of improved fuel system of the present invention.
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING;
The present invention discloses an improved automobile fuel system for elimination of vapour lock. Referring to fig. 1, wherein the fuel system comprising of a return bypass line in the fuel pump which allows circulation of fuel in LPG mode wherein temperature of gasoline does not rise to vaporising temperature and a non return valve for the recirculation. This reduces the temperature of fuel i.e. gasoline does not vaporise resulting in elimination of vapour lock.

The salient features of the invention over prior art
1. Addition of bypass passage in Fuel Pump for return of fuel.
2. Merging of new return circuit in the current return line by a 3-way pipe so that new return line is not required.
3. Addition of Non Return Valve (NRV), so that return Fuel does not go back to Engine.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-

WE CLAIM:
1. An improved automobile fuel system for elimination of vapor lock comprising of a return bypass circuit in the fuel pump, which allows circulation of fuel in LPG mode and a non return valve for the recirculation.
2. An improved automobile fuel system as claimed in claim 1, wherein temperature of gasoline does not rise to vaporizing temperature.
3. An improved automobile fuel system as claimed in claim 1 or 2, wherein said automobile reduces the temperature of fuel resulting in elimination of vapour lock.
4. An improved automobile fuel system for elimination of vapor lock substantially as herein described with reference to accompanying drawing.