Summary of Contents for Honda Accord 1986-310 Service Manual - Page 47

  • Honda Accord 1986-310 Service Manual - Page 47

    Carburetor —Accelerator Pump 7.012 TVPE The accelerator pump supplies the extra fuel necessary to maintain the ideal air/fuel mixture when the accelerator pedal is depressed suddenly at low engine speeds. When the accelerator pedal is depressed, the pump rod, which is connected to the throttle lever, pushes down an the accelerator pump diaphragm. This opens the outlet check valve and allows fuel to be pumped up to the accelerator pump noule, where it is sprayed into the carburetors primary throat. When the accelerator pedal is released, the accelerator pump diaphragm is pushed up by its spring and this closes the outlet check valve. Fuel, from the float chamber, flows into the accleratnr pump chamber through the inlet check valve so that the pump will be ready when the accelerator pedal is again depressed suddenlvt The fuel flow from the accelerator pump is further regulated by the temperature-sensitive bypass valve in the carburetor. When the engine is cold, the bypass portion of the valve is closed so that the accelerator pump nozzle will get the maxi mum of fuel available. When the engine warms up to its normal operating temperature, the bypass valve opens and this allows some of the fuel, which would ordinarily be round to the nozzle, to be bled back into the float chamber of the carburetor, BVPAS VALVE AOCELERATOR PUMP NOZZLE When engine is cold (below 10°C, 50°F), valve is closed. When,engine is hot, valve is open, PUMP DIAPHRAGM 3-10