All-wheel drive models have two separate fuel level sensors. The fuel pump fuel level sensor is located in the left half of the tank, looking in the direction of travel, the auxiliary pump sensor is located in the right half of the fuel tank, also looking forward in the direction of travel. If a problem occurs, both sensors should be checked.
Verification condition: All electrical wires must be checked for current flow according to the electrical diagram, see Chapter Electrical equipment system.
Warning! When removing the sensor, some fuel may leak out. Fuel vapors are toxic, so ensure good ventilation of the room. Avoid contact with skin. Wear fuel-resistant gloves. Do not work near open flames! Keep a fire extinguisher handy!
Removal
1. Disconnect the ground cable from the battery.
Warning! This will erase the engine fault memory or the radio security code. Before disconnecting the battery, read the instructions in Section Removal and installation the battery.
2. Remove the rear seat, see Chapter Body, car painting, car care.
3. Unscrew the fuel pump cover and disconnect the plug.
4. Loosen the hose clamps and disconnect the fuel hoses. Mark the hoses with tape to make installation easier.
5. Loosen the fuel level sensor mounting bolts.
6. Pull the sensor up, tilt it to the side and remove it. Place a rag underneath and collect the leaking fuel.
Examination
1. Holding the sensor in the installation position, measure the resistance with an ohmmeter in the indicated positions of the float. Models up to 9/89: Connect the ohmmeter to the terminals a and b on the plug.
2. The position corresponds to the degree of filling of the gas tank. "0" corresponds to an empty tank, "1/2" corresponds to a half-filled tank, position "1" corresponds to a full tank.
Required values
| Model | Float level in mm | Resistance in Ohm | ||
| 1 | 1/2 | 0 | ||
| since 9/89. | 117 | 3 | ||
| __ | __ | |||
| 0 | 110 | |||
| Compact since 10/89. | 104,2 | 3 | ||
| 50,8 | 32,5 | |||
| 0 | 110 | |||
| Sedan, hatchback from 10/89 model year. | 118 | 3 | ||
| 58,7 | 32,5 | |||
| 0 | 110 | |||
| All wheel drive, Fuel pump sensor | 158 | 0 — 2,5 | ||
| 118 | 7,3 — 13,3 | |||
| 0 | 72,1 — 82,1 | |||
| 4WD, Auxiliary Pump Sensor | 157 | 0 — 2,5 | ||
| 112 | 7,3 — 13,3 | |||
| 0 | 29,9 — 35,9 | |||
If the value does not match the required value, the fuel level sensor should be replaced.
Installation
1. Insert the sensor with a new gasket.
2. Install the sensor and tighten the mounting bolts.
3. Put on the fuel lines according to the markings and secure with clamps.
4. Connect the plug and screw on the cover.
5. Install the rear seat, see Chapter Body, car painting, car care.
6. Connect the ground cable to the battery.
7. If available, set the time on the clock and set the security code for the radio receiver.
8. Check the operation of the fuel level indicator on the instrument panel.
[Article is based on website data: MazBook.ru]