Carbureted engine
The fuel pump is mounted on the cylinder head. It is driven through the pump lever, directly from the camshaft. To check the fuel pump, it must be removed.
Caution: When removing the fuel pump, fuel may spill out. Fuel vapors are poisonous and flammable, so the workplace must be well ventilated. Avoid skin contact with fuel. Put on gloves. Don't kindle the fire. Fire hazard!
Removing
Cars with FBC carburetor
1 - fuel supply hose
2 - ventilation tube
3 - Discharge hose
4 - Hose to carburetor
5 - Fuel pump
6 - Gasket
7 - Adapter flange
8 - Gasket
Cars with VV carburetor
1 - fuel supply hose
2 - ventilation tube
3 - Discharge hose
4 - Hose to carburetor
5 - Fuel pump
6 - Gasket
7 - Adapter flange
8 - Gasket
Loosen the clamps and disconnect the petrol hoses. Seal the hoses with clean screws of a suitable diameter. Mark hoses with adhesive tape.
Attention: When removing the fuel hoses, place a rag to collect any escaping fuel.
Loosen the fixing nuts and remove them with washers.
Remove fuel pump. Remove gaskets and adapter flange.
If necessary, pull the push rod out of the cylinder head.
Examination
Pour a little gasoline into the fuel pump fitting to check the tightness of the check valve. A dry check valve may leak.
By moving the pump lever in different directions, determine the play of the lever. If there is too much play, the pump must be replaced. Pay attention to the force required to actuate the pump in order to have an idea for comparison of the forces expended during subsequent checks.
Close the outlet and return fittings with two fingers. The pump lever must move freely, without resistance.
Close the inlet with your finger. The lever should provide the same resistance as in the pre-test.
Close all fittings with three fingers. The lever should provide the same resistance as in the pre-test.
Close the air outlets with your fingers. The lever should provide the same resistance as in the preliminary check.
If at least one of the tests is negative, the pump must be replaced.
Installation
Carefully use a scraper to free the surface of the cylinder head and intermediate flange from the remnants of the sealing mass.
Set the engine to the TDC position of cylinder 1, see point 1.6.
Lubricate the push rod with oil and insert it into the bore of the cylinder head.
Install the fuel pump with two new gaskets and an intermediate flange and tighten the fastening nuts, do not forget to put the washers.
Connect the hoses according to the markings made and tighten the clamps.
Start the engine and check the tightness of the fuel pump and the connections.