Checking and adjusting the fuel supply by the accelerator pump (VW Beetle)

The fuel supply by the accelerator pump should be checked in cases where fuel consumption is too high, throttle response is too poor, 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 the air filter.

Open the air damper (upper valve in the carburetor) and secure with wire.



Bend a tube 3 mm thick and 1.5 mm in inner diameter (see picture). Place a suitable rubber plug over the end of the tube to connect it to the carburetor spray nozzle.

Place the tube onto the accelerator pump tube.

[The information is posted on this resource VWmanual.ru]



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



Place a measuring cup under the spray tube and fully open and close the throttle valve 5 times.

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



If the required value is not obtained, move the control lever. If the amount of fuel is too much, move the lever in direction 2; if it is too little, move the lever in direction 1.

Check the amount of fuel supplied again.



Check the feed direction. The jet of injected fuel should be directed towards the throttle valve gap.

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

Create pressure on the control valve using your mouth and check the amount of fuel supplied again. In case the required value is not reached (1.25-1.55 cm³/swing for 1600 engine and 1.8-2.2 cm³/swing for 1300 engine), replace the control valve.