If the engine power drops, increased noise is heard, or periodic “howls” are heard during the operation of the fuel pump, then most likely the fuel pump is out of order
First, check the pressure in the fuel supply system by connecting a pressure gauge to the valve on the ramp in the engine compartment (see "Niva Chevrolet fuel pressure reduction").
If the pressure in the system is less than 250 kPa (2.5 kgf/cm 2), replace the fuel filter (see "Replacing the Niva Chevrolet fuel filter").
If this does not help, try removing the pump and flushing the mesh of its receiver (see "Repair of the Niva Chevrolet fuel pump module").
If the pressure still does not rise, the fuel pump must be replaced.
You will need a key "10" (it is more convenient to use a socket wrench).
Disconnect the wire from the "-" terminal of the battery.
Reduce the pressure in the fuel system (see "Niva Chevrolet fuel pressure reduction").
Flip the right side of the rear seat cushion forward.
Flip back the cut-out part of the noise insulation, under which there is a manhole cover above the fuel tank.
Remove the two fixing screws and remove the hatch cover.
Disconnect the wiring harness from the pump adapter.
Remove the spring clips and remove the fuel hoses from the pump nozzles
To prevent gasoline from being forced out of the pump nozzles by excess vapor pressure, remove the filler cap
Unscrew the eight pump mounting nuts (there are spring washers under the nuts).
Lift the pump up, tilt it to move the float of the fuel gauge sensor out of the hatch, and remove the pump together with the clamping ring.
If the pump o-ring remains on the tank, remove it and inspect it.
Replace a severely compressed, loose or torn ring.
If the storage cup remains in the tank when removing the pump, remove it and fix it on the pump housing with caps before reinstalling the pump.
Put the o-ring on the pump and install the pump in the tank, orienting it correctly relative to the fuel hoses
When tightening the pump mounting nuts, press the ring with the pump, overcoming the resistance of the spring installed in the pump
If the car was manufactured after 2009, then we look at this article - Repair of the Niva Chevrolet fuel pump module