Examination
The fuel pump is attached to the cylinder head at the rear of the engine (from the bulkhead of the engine compartment).
Structurally, the pump is non-separable and cannot be repaired. However, it is possible to inspect and test the pump without removing it from the vehicle.
Make sure there is gasoline in the fuel tank.
With the engine running, check for leaks at all fuel line connections from the fuel tank to the carburetor. Tighten loose connections.
Check the hoses for signs of kinks, kinks, which restrict the flow of fuel. The rate of fuel supply by the pump is strongly affected by air leakage and hose clamping from the supply side.
Check for fuel leaks at the pump diaphragm flange.
Disconnect the high-voltage wire of the ignition coil from the ignition distributor and carefully connect the wire to «weight» vehicle to prevent sparks. Then disconnect the fuel supply pipe from the carburetor and place a vessel under it.
Pic. 6.1. Checking the performance of the fuel pump
Turn the engine crankshaft a few revolutions and check that a small amount of fuel comes out of the open end of the tube (pic. 6.1). If fuel does not flow, the fuel supply line with filter is clogged or the fuel pump is faulty.
Disconnect the fuel line on both sides and blow it out with compressed air. If the fuel line is not clogged, replace the fuel pump.
Removal and installation
Warning! Gasoline is extremely flammable, when working with elements of the power system, the use of fire, sparking devices, open flammable light devices and smoking is prohibited. Avoid sparking when handling wires and electrical devices. It is forbidden to carry out work in a garage with a natural gas supply.
Disconnect the wire from the negative battery terminal.
Pic. 6.2. Fuel pump: 1 - fuel supply and return hoses; 2 - fuel pump; 3 - fuel return pipeline
Loosen the clamps with pliers, remove and plug the fuel supply and return hoses (pic. 6.2). Disconnect and plug the fuel return line.
Remove the pump mounting bolts, remove the pump, spacer and gaskets.
Install the pump by placing gaskets on both sides of the spacer.
Connect the fuel hoses, start the engine and check for leaks.