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Высокие технологии Fuel pipes and fittings
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Renewal

Testing

1 Before performing any tests on the fuel level sender unit, completely fill the tank with fuel.

2 Remove the rear seat and the fuel pump/ sending unit access cover (see illustration 3.4). 3 Disconnect the fuel level sender unit electrical connector located on top of the fuel tank.

4 Position the ohmmeter probes on the electrical connector terminals (terminals 1 and 2) check for resistance (see illustration 4.8). Use the 200 ohm scale on the ohmmeter.

5 With the fuel tank completely full, the resistance should be about 4.0 ohms.

6 Reconnect the electrical connector and drive the vehicle until the tank is nearly empty (or syphon the fuel into an approved fuel container using a syphoning kit - not your mouth).

7 Check the resistance. The resistance of the sending unit should now be about 110 ohms.

8 If the readings are incorrect, renew the sender unit. Note: The test can also be performed with the fuel level sending

Fuel and exhaust systems 4A•5

unit removed from the fuel tank. Using an ohmmeter, check the resistance of the sending unit with the float arm completely down (tank empty) and with the arm up (tank full) (see illustration).The resistance should changesteadily from 62 ohms to approximately 2.0 ohms.

9 Remove the fuel pump/fuel level sending unit assembly from the fuel tank (see Section 3).

10 Carefully angle the sending unit out of the opening without damaging the fuel level float located at the bottom of the assembly (see illustration 3.7). Note:On Bosch units, thesender unclips from the container inside the tank - see Section 2.

11 Disconnect the electrical connectors from the sending unit.

12 Remove the screw from the side of the sending unit bracket and separate the sending unit from the assembly.

13 Refitting is the reverse of removal.

- inspection and renewal

Warning: Petrol is extremely flammable, so take extra precautions when you work on any part of the fuel system. Don't smoke

or allow open flames or bare light bulbs near the work area, and don't work in a garage where a natural gas-type appliance (such as a water heater or a clothes dryer) with a pilot light is present. Since petrol is carcinogenic, wear latex gloves when there's a possibility of being exposed to fuel, and, if you spill any fuel on your skin, rinse it off immediately with soap and water. Mop-up any spills immediately and do not store fuel-soaked rags where they could ignite. The fuel system is under constant pressure, so, if any fuel pipes are to be disconnected, the fuel pressure in the system must be relieved first. When you perform any kind of work on the fuel system, wear safety glasses and have a Class B type fire extinguisher on hand.