Relieve pressure in the fuel injection system by disconnecting the control pressure supply hose from the fuel pressure regulator fitting. Disconnect the fuel drain hose from the pressure regulator and lower its end into a beaker. Remove the fuel pump enable relay and connect the output with a jumper to the switch on the relay block «+» from the battery and pump power output. Turn on the fuel pump with the jumper switch for 30 s and check the amount of fuel leaked into the beaker, which should be at the voltage at the terminals:
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