To check the pump, it must be removed.
Caution: When removing the fuel pump, fuel may leak out. Gasoline vapors are especially dangerous because they can cause fire and poisoning. Therefore, special attention must be paid to good ventilation of the working area. Avoid contact of fuel with the skin of the human body. Wear only shoes that protect your feet well. Open flames are not allowed. There is a risk of fire!
Removing
Open the clamps and remove the fuel hoses. Plug the hoses with clean bolts. Mark hoses with adhesive tape.
Attention: When removing the hoses, place a rag and collect accidentally leaked fuel.
Loosen the nuts and remove the fuel pump, gaskets and insulator.
Examination
Pour a small amount of gasoline into the pump nozzles to check the tightness of the check valve. A dry check valve will not work.
Move the fuel pump lever by hand and check its play. If there is too much play, replace the pump. Record the force required to actuate the pump so that you can compare it later.
Close the discharge and return pipes with two fingers. The pump drive lever must move by hand without effort or back pressure.
Close the suction port with your finger. With the same force that was developed before, the pump should be blocked.
Close all three nozzles with your fingers. The pump must also be blocked.
Close the atmospheric opening in the pump with your fingers. The pump drive lever must be locked.
If one of the above checks fails, the pump is damaged and must be replaced.
Installation
Clean the mating surfaces in the cylinder head and the heat-insulating spacer with a scraper from the remnants of the gasket.
Install the heat insulating gasket, fuel pump and two new gaskets, securing them with bolts.
Connect the fuel hoses in accordance with the marking and secure them with clamps.
Start the engine and check the fuel pump and connections for tightness.