Note. According to the regulations, the replacement of individual parts of the fuel module is not provided, and in the event of failure of any of its components, the module is replaced as an assembly. However, in an emergency, to replace the fuel pump, to clean the fuel filter, or to replace the fuel level sensor, the module can be disassembled.
To disassemble the fuel module and replace parts, remove it from the vehicle (see here).
Disconnect the fuel level sensor wiring harness from the cover.
Releasing the latch...
Remove the fuel level sensor by sliding it in the direction of the arrow.
Fuel level sensor: 1 - resistor; 2 - slider; 3 - block of wires of the sensor; 4 - float; 5 - float lever
Use a screwdriver to pry out the three plastic tabs..
... and remove the glass from the fuel module housing. This is where the fuel filter is located (frame) and coarse strainer
Remove the rubber o-ring from the fuel pressure regulator.
The glass contains the fuel pressure regulator 1 and the anti-drain valve 2.
Having overcome the force of the clamps, remove the mesh fuel filter.
Rinse, blow out, or replace the strainer.
Note. to replace the fine filter, some motorists used a non-original filter with art. LF249M (see photo and dimensions)
Squeezing the lid latch with a screwdriver..
... answer cover aside.
remove the expansion spring.
Disconnect the fuel pump connector from the connector on the inside of the cover.
Remove the fuel pump from the fuel filter housing.
Note. The fuel hoses are heat-shrinkable on the pump fittings and the filter housing.
After heating the plastic corrugated tube on the pump nozzle, remove the tube from the pump nozzle.
Use for this a jet of boiling water from a kettle, or a hair dryer.
Attention: before using a hair dryer, thoroughly blow and dry the parts, in order to avoid fuel ignition!
Note. After removing the hoses from the fittings, the hoses may need to be replaced to ensure a good seal. Some motorists used corrugated fuel pump hoses for VAZ.
To install and secure the hose on the fuel pump after removal, some motorists use conventional clamps (but not worm type) ~11 mm. The clamp must be fixed in such a way as to ensure a tight connection and at the same time not to transfer the plastic hose.
We assemble and install the module in the reverse order.
Some misconceptions about the fuel pump
The slightest loss of tightness of the pump will immediately lead to a fire, since its brushes are constantly sparking.
The fuel pump is not a hermetically sealed construction, and its giblets, such as an anchor or brushes, are constantly bathed in gasoline. But ignition is impossible: the concentration of fuel vapors is much higher than stoichiometric, and therefore it is impossible to set them on fire.
Fuel-injected cars need to be refueled more often, and «on a light bulb» you can't drive at all.
Many people believe that with an incomplete tank, the pump will definitely start to sip air instead of gasoline and quickly die. The pump is housed in a plastic cup, which prevents the outflow of fuel during accelerations and rolls. The glass is pressed by a spring to the lowest point of the fuel tank. In addition, internal baffles in the fuel tank prevent the ebb and flow of gasoline. What if the fuel runs out? And there will be no trouble: as soon as the pump stops creating pressure, the engine will stall, and the controller will remove power after a couple of seconds.
motor running «dry», crashes instantly.
With a stalled internal combustion engine, power is removed from the electric fuel pump very quickly. Therefore, he does not have the physical ability to thresh for a long time in «dry» mode. Also, we used to race pumps «dry» about ten minutes - and nothing: a cold case, low current consumption, even noise. Therefore, the pump will not die with its death from a lack of gasoline.
Gasoline plays the role of lubricant in the electric fuel pump.
The lubricity of gasoline is negligible. It does not act as a lubricant, but as a coolant.
Excessive pressure in the fuel line is harmful, therefore, when replacing, it is absolutely impossible to install a more powerful fuel pump.
bypass valve (pressure regulator) in the fuel module monitors the amount of pressure generated by the fuel pump, sending excess fuel back to the gas tank. Therefore, a more efficient pump
won't do any harm. Another thing is if you installed a motor that is weaker than the standard one: when operating in maximum modes, the engine may not have enough fuel and it will start «shut up».
On cars converted to gas, fuel pumps break down especially often.
There are horror stories on Internet forums: the gas pump on cars with gas equipment always works, driving gasoline in a small circle, and therefore fails more often. But this is a normal mode, no different from the working one. Troubles could arise only in the absence of gasoline in the tank, but this is already reminiscent of sabotage. However, short work «dry» pumps are also not afraid.