If your Jaguar has a broken fuel gauge, don’t take it lightly! It’s not just a matter of running out of gas and being stranded. You can also severely damage your car. In this article, we’ll discuss what causes fuel gauge issues, what signs to look for, and what you can do about it.
What is a Fuel Gauge, and What Does It Do?
A fuel gauge is an instrument that measures and shows the amount of fuel your Jaguar has in its fuel tank. It is a critical part of any vehicle. Fuel gauges can be analog or digital, and they work differently. Typically, the system works like this:
- Fuel Level Sensor: A float is placed in the fuel tank that moves up or down according to the fuel level. It is connected to a metal rod, which remains in constant contact with a resistor.
- Electronic Signal: Depending on how high or low the gauge is, the resistor sends an appropriate electronic signal to the fuel gauge on your dashboard.
- Fuel Gauge: This is the actual display on your dashboard, where the signal from the resistor is shown in a manner that a human can read and understand it.
Top Reasons Why the Fuel Gauge Fails
- Fuel Sending Unit Failure: This unit, which is situated in the fuel tank, is responsible for measuring the amount of gas in the tank and then sending that information to the fuel gauge. If the fuel-sending unit is compromised, your Jaguar’s fuel gauge will malfunction.
- Sensor Problems: If the sensor is not working as intended, you will get inaccurate readings on your fuel gauge.
- Faulty Wires: Damaged or broken wires between the fuel-sending unit and your fuel gauge will disrupt the connection and will cause incorrect readings.
- Blown Fuse: If the circuit has a blown fuse, it will completely stop working.
- Issues with Grounding: If there is a problem with the grounding, the fuel gauge will receive inaccurate readings.
- Damaged Arm or Sender Float: Since the arm and sender float work together, any one of these affected parts can impact the accuracy of the fuel level readings.
- Fuel Gauge Itself: If the fuel gauge itself is somehow damaged, you will not get correct readings. This can sometimes happen due to internal circuit issues.
Look for These Warning Signs That the Fuel Gauge is Not Working
If you notice these signs, you may be having problems with your fuel gauge. Bring your Jaguar in for a check:
- Fuel Gauge Stuck: If the fuel-sending unit is malfunctioning, you may notice the fuel gauge in your dash stuck at ‘full’ or ‘empty’ even though the fuel level in the tank is different.
- Fluctuating Fuel Gauge: If the needle on your fuel gauge fluctuates erratically, there is definitely a problem with the system.
- Incorrect Readings: If you continuously notice your fuel gauge is not registering the correct fuel level in the tank, it could be due to a blown fuse or corroded wires.
How to Deal With a Broken Fuel Gauge?
If you suspect your Jaguar has a faulty fuel gauge, it’s best to take your car to a professional mechanic. There’s more than one thing to check. A trained mechanic will usually do the following if not more.
- Multimeter Testing: A skilled mechanic will use a multimeter to detect the resistance of the fuel-sending unit and determine if it is functioning correctly. Inconsistent readings may require you to replace the unit.
- Wiring Inspection: There are many wires throughout the system and if any one of them is compromised, you’ll need that fixed. Your mechanic will check all these wires.
- Fuse Replacement: Your mechanic will look for any blown fuses in the circuit and replace them. The fuse box is usually found under the dashboard or hood.
- Testing the Fuel Gauge: Here again, you’ll need a multimeter to test the voltage of the fuel gauge. If your mechanic finds the voltage is correct but the gauge is still not working, then you may need to change it.
- Proper Grounding: The mechanic will ensure the grounding connections are clean and secure so as not to cause the system to behave erratically.
- Recalibration: Sometimes, the fuel gauge may need to be recalibrated. Something a professional mechanic can help you with.
At Kruse Lucas Imports, we can help you with all your Jaguar problems, including ongoing maintenance. Call us or book an appointment to visit us in Manteca, Oakdale, Ripon, Turlock, or Modesto in California.