When the amount of fuel in the tank decreases, the sensor float lowers and moves the contact of the variable resistor, changing the level of its resistance. The voltage at the input of the fuel gauge also changes and causes the gauge needle to vibrate.
Necessary
- Ohmmeter (multimeter, tester).
- Sensor removal tool kit.
- A rag or napkins.
Instructions
Step 1
When removing the sensor, make sure that the fuel tank is not completely full. Drain the fuel from the tank or pump it out with a pump. Do not inhale gasoline vapors to avoid poisoning. Work outdoors or in a ventilated area.
Step 2
Disconnect all wires from the battery terminals. Get close to the fuel level sensor located on the fuel tank. Mark the position of the fuel hoses in any way (for example, with electrical tape). Disconnect the fuel hoses from the fuel level sensor by loosening their clamps. Disconnect the hoses gradually, wiping up spilled fuel with a rag. Disconnect the electrical connector from the sensor.
Step 3
If the sensor is installed on the fuel module, there are several wires leading to it. For ease of assembly, note the location and colors of the wires to be disconnected. After unscrewing the sensor mount, lift it up and remove it by tilting to the side. Remove the leaked fuel with a rhinestone. Disconnect the marked fuel hoses.
Step 4
To test the sensor, connect an ohmmeter to the ground and variable resistor terminals of the sensor. Holding the sensor in the position where the float is at the bottom (no fuel), and the contacts of the fuel reserve indicator lamp are closed, take the ohmmeter reading. Compare the reading with the specification.
Step 5
Turn the sensor over so that the float is in the upper position (full tank). Measure the resistance between pins and compare with the requirements of the specifications. Move the sensor smoothly from one position to another. In this case, the resistance on the ohmmeter should also change smoothly, without jumps and dips. Connect an ohmmeter to the sensor ground and fuel reserve warning lamp. In the normal position (empty tank), the resistance should be almost zero. In the inverted position (full tank), the resistance should be infinitely high.
Step 6
Install a new O-ring on the sensor when reassembling. To do this, first insert the O-ring into the hole, and then the sensor itself. After assembly, check the operation of the fuel gauge on the instrument panel.
