The fuel rail is removed to replace injectors and repair the cylinder head, as well as when replacing the rail itself
The fuel rail is usually removed to check and replace injectors, as well as to repair the cylinder head.
Reduce the pressure in the fuel system (see “Reducing fuel pressure in the engine power system”).
Remove the wire from the negative terminal of the battery.
Remove the decorative engine cover (see “Removing and installing the decorative engine cover”).
Remove the air filter (see “Removing and installing the air filter”).
Remove the throttle assembly from the intake manifold (see “Removing and installing the throttle assembly”).
Remove the intake manifold (see “How to replace the cylinder head cover gasket of a VAZ-21126”).
Squeeze the latch
Remove the injector wiring harness block.
Remove the pads from the remaining three injectors in the same way.
Perform an initial check of the injector windings.
To do this, connect an ohmmeter to the contacts in the injector connectors one by one and in each case measure the resistance of their windings.
It should be 11–15 Ohms.
If the resistance value is different when measuring an injector, then this injector is faulty and must be replaced (see “Checking and replacing injectors”).
To replace the injector wiring harness or fuel rail, you need to cut the mounting clamps with side cutters.
This operation is not required to replace injectors.
In the future, for clarity, the wiring harness has been removed.
Unscrew the fuel supply pipe fitting
Use a special “17” wrench to unscrew the tube fittings.
Be sure to hold the fuel rail tip nut with a second open-end wrench.
Disconnect the fuel pipe from the rail
Remove the two screws securing the fuel rail
Remove the ramp together with the injectors.
Please note: the connection between the tube and the ramp is sealed with a rubber ring.
Be sure to replace a strongly compressed, hardened or torn ring.
If any injector remains in the engine intake pipe when removing the fuel rail, replace its O-rings and retainer.
Install and secure the fuel rail in the reverse order of removal, lubricating the O-ringsnok with motor oil or WD-40.
When installing the fuel rail, so that the injector wiring harness does not touch the engine, secure it to the rail with new plastic clamps.
Having installed the fuel rail, connected the fuel line and connected the wiring harness block, secure the negative terminal on the battery, turn the ignition key 3-4 times to position “I” (ignition) with intervals of 2-3 s between turns on and check tightness of the pipeline connection and injector seals.
Install all removed parts in the reverse order of removal.