All-wheel drive models have two separate fuel gauges. 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.
Check condition: All electrical wires must be checked for current flow according to the electrical diagram, see Chapter Electrical system.
Attention! When removing the sensor, some fuel may come out. Fuel vapors are poisonous, so ensure that the room is well ventilated. Avoid skin contact with fuel. Wear fuel resistant gloves. Do not work near open flames! Keep a fire extinguisher ready!
Removing
1. Disconnect the ground cable from the battery.
Attention! This erases the data from the engine fault memory or the radio's security code. Before disconnecting the battery, read the instructions in Section Removing and installing 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. To facilitate installation, mark the hoses with adhesive tape.
5. Loosen the bolts of the fuel level sensor.
6. Pull the sensor up, tilt it to the side and remove it. When doing this, place a rag and collect the escaping fuel.
Examination
1. While 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 an 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, the position "1" corresponds to a full tank.
Required values
| Model | Float level in mm | Ohm resistance | ||
| 1 | 1/2 | 0 | ||
| since 9/89 issue. | 117 | 3 | ||
| __ | __ | |||
| 0 | 110 | |||
| Compact since 10/89 issue. | 104,2 | 3 | ||
| 50,8 | 32,5 | |||
| 0 | 110 | |||
| Sedan, hatchback since 10/89 | 118 | 3 | ||
| 58,7 | 32,5 | |||
| 0 | 110 | |||
| AWD, Fuel pump sensor | 158 | 0 — 2,5 | ||
| 118 | 7,3 — 13,3 | |||
| 0 | 72,1 — 82,1 | |||
| AWD, Auxiliary pump sensor | 157 | 0 — 2,5 | ||
| 112 | 7,3 — 13,3 | |||
| 0 | 29,9 — 35,9 | |||
If the value is not as specified, 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 marking 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 mass cable to the battery.
7. If available, set the clock and set the radio security code.
8. Check the operation of the fuel gauge on the instrument panel.