We replace the fuel pressure reducing valve if the fuel pressure is not correct

Reduce the pressure in the fuel system if the engine has just been stopped.

Disconnect the wire from the "negative" terminal of the battery.

Remove the engine fuel line.

Reducing valve replacement

Disconnect fuel drain hose 1 and vacuum hose 4 from pressure reducing valve 3.

Remove two fastening bolts 2 and remove the pressure reducing valve 3 from the engine fuel line.

Install the new valve in reverse order

Let's analyze this operation in more detail:

Relieve fuel pressure, for this:

ZMZ-406 pressure regulator replacement ZMZ-406 pressure regulator replacement

With the ignition off, remove the cover of the fuse box and remove the fuel pump fuse F9.

We start the engine and let it work out the gasoline that is in the system under pressure.

After the engine stalls, turn off the ignition and replace the fuse.

Disconnect the negative battery terminal

Remove the fuel rail, for this:

Replacing the ZMZ-406 pressure regulatorReplacing the pressure regulator ZMZ-406

Disconnect the idle speed control connector

Using a screwdriver, we loosen the clamp of the air supply hose to the throttle body

Remove the air supply duct and the air damper cable from the throttle pipe

Replacing the pressure regulator ZMZ-406Replacing the pressure regulator ZMZ-406

Use a screwdriver to loosen the clamp of the lower (outlet) hose of the idle speed regulator.

Replacing the pressure regulator ZMZ-406Replacing the pressure regulator ZMZ-406

Using a screwdriver, loosening the clamp, remove the hose of the crankcase ventilation system.

Using a screwdriver, loosening the clamp, remove the vacuum brake booster hose.

Replacing the ZMZ-406 pressure regulatorReplacing the ZMZ-406 pressure regulator

Using a screwdriver, loosening the clamp, remove the fuel pressure regulator hose.

Using a 13 key, we unscrew the nut that secures the tip of the “ground” wire to the first stud of the intake manifold.

Replacing the pressure regulator ZMZ-406

Similarly, disconnect the wire from the last intake manifold stud.

Then, having unscrewed the remaining nuts of the intake manifold studs with a wrench by 13, remove the receiver.

Replacing the pressure regulator ZMZ-406Replacing the pressure regulator ZMZ-406

With a screwdriver, loosen the clamp of the supply hose to the ramp

Remove the supply hose from the fitting of the fuel rail.

Replacing the pressure regulator ZMZ-406Replacing pressure regulator ZMZ-406

Using a screwdriver, loosening the clamp, remove the crankcase ventilation hose from the idling system pipe.

Using a screwdriver, loosening the clamp, remove the drain hose from the fitting of the fuel pressure regulator.

Replacing the pressure regulator ZMZ-406

Using a 10 key, we unscrew the two screws securing the fuel rail to the intake manifold and remove the rail.

ZMZ-406 pressure regulator replacementReplacing the pressure regulator ZMZ-406

Use a screwdriver to unscrew the two screws securing the regulator to the ramp.

We install the new regulator in the reverse order, making sure that a sealing collar is put on its fitting.