Checking and replacing a fuel sender unit
If the fuel gauge reads ‘empty’ when you know there is fuel in the tank, the
cause may be a faulty sender unit the electrical device that measures the
level.bearing auto oil seals CHEAP AND
FINE.
Or it may be a faulty gauge or a break in the wiring between the gauge and sender.It is also possible for the fuel tank to read ‘full’ constantly, although the car has travelled some distance and has obviously used an amount of petrol.auto oil seals.The cause may be a fault in the insulation of the wiring, resulting in a short circuit.Checking the sender unit in the petrol tank The sender unit may be fitted in the top or the side of the tank. Often it is hard to find, particularly if it is on the top, and you may have to remove some trim from inside the boot.shaft oil seals.
Most senders are circular. Generally the fuel pipe (or pipes, in a circulating system) is connected to it.
There is an electrical connection to the fuel gauge, and sometimes a second one for a low-fuel warning light. Check that the connection is not loose, and that the wiring has not become kinked, or trapped, breaking the insulation and causing a short circuit.bearing auto oil seals CHEAP AND FINE.
Ask a helper to watch the fuel gauge, then switch on the ignition. Disconnect the fuel-gauge wire from the sender unit and scratch its bare end against the tank, or any other bare metal on the chassis or bodywork, to earth it.dust oil seals.
If the gauge needle swings to ‘full’ although the tank is half-full, there is no electrical fault, but there may be a mechanical fault in the sender unit, such as a detached float.
If the needle stays still, try earthing the wire by touching it to an unpainted point on the car body. If the needle moves now, the tank is not properly earthed. Remove and clean some of its mounting bolts or screws.viton oil seals.
If the needle does not move at all, there may a break in the wiring.auto oil seals.Check the wiring to the gauge with a circuit tester – one lead connected to the wire detached from the sender and the other to the terminal on the gauge.If the tester shows continuity in the wire, the gauge is faulty.If the sender unit is faulty, fit a new one, but note the safety precautions.bearing auto oil seals CHEAP AND FINE.
Or it may be a faulty gauge or a break in the wiring between the gauge and sender.It is also possible for the fuel tank to read ‘full’ constantly, although the car has travelled some distance and has obviously used an amount of petrol.auto oil seals.The cause may be a fault in the insulation of the wiring, resulting in a short circuit.Checking the sender unit in the petrol tank The sender unit may be fitted in the top or the side of the tank. Often it is hard to find, particularly if it is on the top, and you may have to remove some trim from inside the boot.shaft oil seals.
Most senders are circular. Generally the fuel pipe (or pipes, in a circulating system) is connected to it.
There is an electrical connection to the fuel gauge, and sometimes a second one for a low-fuel warning light. Check that the connection is not loose, and that the wiring has not become kinked, or trapped, breaking the insulation and causing a short circuit.bearing auto oil seals CHEAP AND FINE.
Ask a helper to watch the fuel gauge, then switch on the ignition. Disconnect the fuel-gauge wire from the sender unit and scratch its bare end against the tank, or any other bare metal on the chassis or bodywork, to earth it.dust oil seals.
If the gauge needle swings to ‘full’ although the tank is half-full, there is no electrical fault, but there may be a mechanical fault in the sender unit, such as a detached float.
If the needle stays still, try earthing the wire by touching it to an unpainted point on the car body. If the needle moves now, the tank is not properly earthed. Remove and clean some of its mounting bolts or screws.viton oil seals.
If the needle does not move at all, there may a break in the wiring.auto oil seals.Check the wiring to the gauge with a circuit tester – one lead connected to the wire detached from the sender and the other to the terminal on the gauge.If the tester shows continuity in the wire, the gauge is faulty.If the sender unit is faulty, fit a new one, but note the safety precautions.bearing auto oil seals CHEAP AND FINE.
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