Fuel supply system for internal combustion engine

In a system for supplying additional fuel to a fuel-air intake system when an internal combustion engine is accelerated, said system including a fuel source, means for supplying fuel into said intake system, a fuel pipe interconnecting said fuel source and said means, the improvement which comprises means for sensing engine temperature and an acceleration compensator for supplying fuel from said fuel source to said intake system through said fuel pipe and said means in response to changes in pressure in said intake system and comprising:

• a diaphragm chamber;
• a diaphragm dividing said chamber into a first region and a second region, said first region being connected to said intake system, said second region having therein an inlet port connected to said fuel source through said fuel pipe and an outlet port connected to said intake system through said fuel pipe and said injecting means;
• a spring for biasing said diaphragm toward the minimum volume position of the second region;
• a check valve means normally closing said fuel pipe, said check valve means opening in response to increase in the volume of said second region to permit inflow from said fuel source to said second region and closing in response to decrease in volume to permit outflow from said second region to said injecting means;
• a temperature responsive means blocking expansion of said second region in response to increase of the engine temperature;
• and
• a second valve means for cutting off communication between said intake system and said first region, said second valve means being adapted to cut off the communication at the time the engine temperature is higher than a predetermined value.