What are the parts of a gas gauge?
The gas gauge system can be broken down into three basic parts: gauge, sender, and circuit. A fault in one or more of these parts will lead to gas gauge failure. The sending unit is usually part of the Fuel Pump Module : a combination of parts that includes the fuel pump, fuel strainer, fuel filter, and fuel float.
How does a fuel pump work on a gas gauge?
The fuel pump module includes the fuel sending unit, used by the gas gauge to detect and display fuel level. https://www.flickr.com/photos/3ndymion/33556245572. The gas gauge is a relatively simple circuit, but its simplicity means each component is essential to its function.
What happens when you test the gas gauge?
Gas gauge test. When testing at the gas gauge, repeat the voltage check from the sending unit. The voltage should be exactly the same as when you tested at the sending unit. If the voltage is different, you likely have corrosion or poor wiring between the sending unit and the gas gauge.
When to look at the fuel gauge on a Harley?
I can’t remember ever looking at my fuel gauge while accelerating or braking. Usually that is reserved for steady speed and non threatening traffic situations. Harley owners have reported just about every possible malfunction possible with fuel gauges (all models/years). Dealer response is usually “they all do that”.
What causes a fuel gauge to read full?
Fuel gauge stuck on full Another, less common, symptom of an issue with the fuel gauge sender is a fuel gauge that is stuck on full. A faulty fuel gauge resistor can send a bad signal to the instrument cluster which can cause the gauge to permanently read full.
How does the sender float on a fuel gauge work?
The sender float is designed to float on the surface of the fuel inside of the tank. As the level drops, the position of the arm and float will shift and move a resistor which controls the display on the gauge.
The gas gauge system can be broken down into three basic parts: gauge, sender, and circuit. A fault in one or more of these parts will lead to gas gauge failure. The sending unit is usually part of the Fuel Pump Module : a combination of parts that includes the fuel pump, fuel strainer, fuel filter, and fuel float.
How does the resistance of a gas gauge change?
The fuel float contacts run on a potentiometer, or variable resistor, whose resistance changes depending on float level, effecting a change in output voltage. Some systems are wired so that high fuel level contacts the low-resistance section, gradually increasing resistance as fuel level drops.
Why does my gas gauge keep pegging full?
The gas gauge might interpret voltage feedback from a dead sender as FULL or EMPTY, consequently pegging the gauge no matter the actual fuel level. Circuit Problems can cause the gas gauge to stop functioning normally.
What should I use to test my gas gauge?
Before you begin testing your gas gauge, gather the following tools: an electrical wiring diagram (EWD), a digital multimeter (DMM), and basic hand tools. Then, run through the following tests to determine the source fo the problem. Instrument cluster self-test.
What do I need for a fuel gauge sender?
This is what you will need: Resistors at the following values: 20 Ohms, 35 Ohms, 65 Ohms, 105 Ohms, 222 Ohms. Optionally you can just set the sender to these values. A 10VDC power source.
The gas gauge might interpret voltage feedback from a dead sender as FULL or EMPTY, consequently pegging the gauge no matter the actual fuel level. Circuit Problems can cause the gas gauge to stop functioning normally.
What kind of wire is on fuel gauge?
It has 2 wires; a brownground wire that attaches to the grounded tab connector and a yellow(or some other color) “signal” wire that attaches to the insulated tab connector. IMPORTANT: Looseconnectors at the sender or vibrator will cause inaccuraciesin gauge readings.
Before you begin testing your gas gauge, gather the following tools: an electrical wiring diagram (EWD), a digital multimeter (DMM), and basic hand tools. Then, run through the following tests to determine the source fo the problem. Instrument cluster self-test.