Effects of a Bad Fuel Sending Unit in Your Car

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EFFECTS OF A BAD FUEL SENDING UNIT IN YOUR CAR
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The most common problem that causes the fuel
gauge to read incorrectly is a bad fuel sending
unit.
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This unit is used to measure the amount of fuel
in the fuel tank and communicate the fuel level
to the fuel gauge.
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A bad fuel sending unit can lead to a
misunderstanding of the fuel level in the fuel
tank.
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Here are some effects of a bad fuel sending unit
in your car.
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FUEL GAUGE READING EMPTY BUT THE TANK IS FULL
A fuel gauge that only reads empty may be caused
by the float separating from the arm.
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This causes the rest of the components in the
fuel sending unit to stop completely.
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A faulty resistor can also cause the gauge to
read empty by restricting the signal completely.
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Corroded wires located on the fuel pump, can stop
voltage either from the source or to the fuel
gauge.
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FUEL GAUGE IS STUCK ON FULL
A fuel gauge that only reads full may be caused
by a faulty fuel gauge resistor.
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Over time, the wiper in the variable resistor can
wear down the resistive material strip, creating
an open circuit.
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There may be a defect in the wiring from the fuel
sending unit to the fuel gauge.
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There can be a shorted signal, a bad ground wire
to the grounding terminal or a faulty fuel gauge.
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A FLUCTUATING FUEL GAUGE
A fuel gauge displays that fluctuates between
empty and full may be due to a mechanical
failure.
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The fuel sending unit float arm may stick at
certain levels and then fall back into place.
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Once the float arm falls back into place, the
fuel gauge becomes accurate again.
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This event can often be replicated, giving more
evidence of mechanical failure.
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