Fuel injection pump supply

The fuel from the tank is forced through the filter by a feed pump to the injection pump. The vane pump in the distributor pump increases the pressure to a maximum of 180-240 Mpa (18-24 barium). The pressure can be measured with a pressure gauge with an appropriate nipple (M14x1,5) on the fuel overflow bolt. This high system pressure is essential, because the fuel has a complicated path to the radial pistons.

The VP44 pump is fuel lubricated and must not run dry, because unlike the VP30 pump it is not self-venting. Attempting to start the engine, when the fuel tank is empty, risk of damaging the injection pump!

Most manufacturers protect their pumps from running dry, i.e.. when the fuel level drops below a certain value, in this way, that the engine stops by itself. First, the fuel level control lamp warns the driver that the fuel level is too low, then the engine starts to jerk and if the driver does not react, the engine cuts out, and the fault will be recorded in the diagnostic memory. Only then may the engine be started, when the fuel in the tank is topped up to the minimum level.

On Opel four-valve engines 2,0 or 2,2 dm3 excess fuel drain lines (leaks) the injectors are connected to the fuel supply circuit. Thus, a leaky fuel outlet pipe from the injector can cause air to the fuel system. Engine
lint, and does not even start. So before you reach for the control of electronics, first check the tightness of the fuel outlet pipes from the injectors.

Any newly installed fuel filter must be filled with fuel, to prevent air from entering the pump. The filter is placed on the fuel supply line from the tank. If the car is equipped with an electric fuel pre-feed pump, the filter can be refilled by switching the ignition on and off several times. If the car does not have a fuel pre-supply pump, suck fuel into the filter with a manual vacuum pump.