Checking and adjusting the fuel supply by the accelerator pump

The fuel supply of the accelerator pump must be checked in cases where the fuel consumption is too high, the throttle response is too poor when adding "gas", the engine does not respond well to pressing the accelerator pedal and accelerates slowly.

Run the engine briefly to fill the carburetor float chamber.

Remove air filter.

Open air damper (top choke in carburetor) and secure with wire.



Bend tube 3mm thick and 1.5mm inside diameter (see fig.). Pull a suitable rubber plug onto the end of the tube to connect to the carburetor sprayer.

Put the tube on the tube of the accelerator pump.



Turn the throttle lever from lock to lock several times until fuel starts to flow out of the tube.


Place a beaker under the spray wand, fully open and close the throttle valve 5 times.

Divide the amount of fuel obtained by 5 and compare the calculated value with the required (see table at the end of the chapter) (for the Kafer 1300 car - taking into account the temperature of the carburetor body).



If the desired value is not obtained, move the control lever. If the amount of fuel is too high, move the lever in direction 2; if it is too low, move the lever in direction 1.

Check the amount of fuel supplied again.



Check feed direction. The jet of injected fuel must be directed at the throttle valve slot.

Since there is no vacuum in the idle engine, the amount of fuel supplied to the 1600 engine should be 0.75-1.05 cm³ for one swing, and in the engine 1300 - 1.15-1.45 cm³. The amount of fuel is adjusted by turning the adjusting screw (see arrow).

Pressurize the control valve with your mouth and check the amount of fuel supplied again. If the required value is not reached (1.25-1.55 cm³/swing for 1600 engine and 1.8-2.2cm³/swing for engine 1300), replace the control valve.