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Pressure regulator is installed at the outlet of the fuel line
and has two cavities separated by a diaphragm. In the upper
cavity there is a spring that presses on the diaphragm and closes
the outlet. Fuel from the pump is fed into the lower cavity. If
the pressure in the lower cavity reaches a certain value, the
diaphragm rises, and the excess fuel in the inlet line of the
injector is sealed with rubber sealing rings.

1 - fuel ramp; 2 - pressure regulator; 3 - vacuum hose; 4 - inlet
pipe; 5 - nozzle; 6 - nozzle lock

Figure 6.2 - Fuel ramp with nozzles of the gas injection
system
Fuel pump provides excess fuel feed. In this case, excess
fuel returns to the fuel tank. Typically for a distributed injection
system, the maximum pump pressure is 5 bar. The function of
the pressure regulator (Figure 6.2) is to maintain constant
pressure in the system and to ensure the possibility of returning
excess fuel to the tank. Fuel pressure regulator is installed on
the fuel ramp of the tank. Only one external or internal pump,
either internal or external, can be installed in the system.The
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