If engine power drops, increased noise occurs, or periodic whining sounds are heard when the fuel pump is running, then the fuel module is most likely faulty. Preliminarily check the pressure in the fuel supply system (see "Checking the pressure in the fuel system"). If the pressure in the system is less than 380 kPa, then the fuel pressure regulator, the electric fuel pump itself, or the fuel filter is probably faulty. To eliminate these faults, the fuel module must be replaced as an assembly, since its design is non-separable. Only the fuel level indicator sensor can be replaced.
1. Reduce the pressure in the fuel system (see "Reducing pressure in the fuel system").
2. Disconnect the wire from the negative terminal of the battery.
3. Remove the fuel tank (see "Replacing the fuel tank and its filler pipe").
4. Pull out the locking bracket...
5. ...and disconnect the wiring harness connector from the fuel module.
6. By pressing the lock...
7. ...disconnect the high-pressure fuel line tip from the module fitting.
8. Turn the fuel pump module bayonet mount clamping ring counterclockwise until the ring protrusions come out from under the fuel tank flange clamps...
NOTE: There is a special tool for turning the fuel pump module mounting clamp ring. If this tool is not available, loosen the ring by lightly striking it with a hammer through a screwdriver, applying force alternately to the diametrically located protrusions of the ring.
9. ...and remove the ring.
10. Remembering the position of the fuel pump module adapter flange relative to the fuel tank (to facilitate its installation during reassembly), remove the flange, carefully remove the module and drain the fuel from it into a previously prepared container.
NOTE: The fuel module adapter flange is sealed with a rubber ring.
Be sure to replace this ring every time the pump is removed.
11. If necessary, remove the fuel level indicator sensor from the fuel module (see "Replacing the fuel level indicator sensor").
12. Install the parts in the reverse order of removal.
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