How to remove the fuel rail and the VAZ-2112 engine regulator

Removing and Fitting the VAZ-2112 Engine Fuel Rail

We remove the fuel rail to replace and check the operation of the injectors and when carrying out fault-finding work related to the operation of the fuel system.

Removing the fuel rail

We prepare the vehicle for the work.
We disconnect the negative terminal of the battery.
We remove the receiver (see Removing the receiver and intake manifold of the engine).
We close the intake manifold opening with plugs.
We disconnect the vacuum hose from the fuel pressure regulator.

Fig. 1. Disconnecting the vacuum hose from the fuel pressure regulator

Using a Phillips screwdriver, we slacken the crankcase ventilation hose clamp.

Slackening the ventilation hose clamp — Fig. 2. Slackening the crankcase ventilation hose clamp

We disconnect the hose from the cylinder head cover union.

Disconnecting the hose from the head cover — Fig. 3. Disconnecting the hose from the cylinder head cover union

Using a 10 mm spanner, we unscrew the oil dipstick guide tube retaining bolt.

Unscrewing the guide tube bolt — Fig. 4. Unscrewing the oil dipstick guide tube retaining bolt

We remove the guide tube.

Removing the guide tube — Fig. 5. Removing the oil dipstick guide tube

We disconnect the fuel rail connector.

Fig. 6. Disconnecting the fuel rail connector

Using two 17 mm spanners, we disconnect the fuel rail pipes from the supply and return hoses, relieving the fuel pressure (the return hose and pipe are marked with blue paint).

Disconnecting the supply pipe — Fig. 7. Disconnecting the fuel supply pipe

Disconnecting the return pipe — Fig. 8. Disconnecting the fuel return pipe

Using a Phillips screwdriver, we unscrew the bolt of the fuel pipe bracket and remove it.

Unscrewing the bracket bolt — Fig. 9. Unscrewing the fuel pipe bracket bolt

Removing the bracket — Fig. 10. Removing the fuel pipe bracket

Using a 5 mm hex key, we unscrew the two fuel rail retaining bolts and remove it complete with the injectors and the fuel pressure regulator.

Unscrewing the rail retaining bolts — Fig. 11. Unscrewing the fuel rail retaining bolts

Fig. 12. Removing the fuel rail as an assembly

Dismantling the fuel rail

Using a 24 mm spanner, we unscrew the nut securing the fuel return pipe to the pressure regulator and withdraw the pipe.

Unscrewing the return pipe nut — Fig. 13. Unscrewing the fuel return pipe securing nut

Using a 5 mm hex key, we unscrew the two fuel pressure regulator retaining bolts from the rail.

Unscrewing the regulator bolts — Fig. 14. Unscrewing the fuel pressure regulator retaining bolts

We slide the fuel supply pipe retainer plate along the rail and withdraw the pipe.

Sliding the retainer plate — Fig. 15. Sliding the fuel supply pipe retainer plate

Rocking it, we withdraw the fuel pressure regulator from the rail.

Fitting the fuel rail

Assembly and fitting of the fuel rail with the pressure regulator are carried out in the reverse order.

Important! If necessary, replace the fuel pipe sealing rings with new ones.

We replace the injector sealing rings with new ones and lubricate them with engine oil.
We tighten the pressure regulator and rail retaining bolts to a torque of 9–13 N·m.
We tighten the fuel pipe union nuts to a torque of 20–34 N·m.