2007 Subaru WRX
Fuel gauge does not work porperly.
When the tank is topped off, the fuel gauge reads full, but after much driving the gauge only drops to 3/4 a tank and slowly to half of a tank on the gauge read out.
I have also ran out of gas (car stalls and when I topped off the tank after the car stalling it took a full 14.8+ gallons to fill the tank car is a 15 gallon tank) When i ran out of gas the fuel gauge read that it was slightly below half full.
Hi it can really only be two things, first is the fuel sender on the pump inside the tank it could be stuffed or sticking causing a false reading, second it can also be a faulty fuel gauge on the dash.
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If the gas gauge of your 2007 Dodge Nitro R/T always shows a full reading, there could be a few possible causes for this issue:
Faulty fuel level sensor: The fuel level sensor is responsible for measuring the amount of fuel in the tank and sending that information to the gauge on the dashboard. If the sensor is malfunctioning or stuck in the "full" position, it will consistently display a full reading on the gas gauge.
Wiring or electrical issue: There might be a problem with the wiring or electrical connections between the fuel level sensor and the gauge. If there is a loose or damaged wire, it could prevent the accurate transmission of fuel level data to the gauge.
Instrument cluster malfunction: The problem could be with the instrument cluster itself, where the gas gauge is located. If there is a fault in the cluster's circuitry or display, it may cause the gauge to always show a full reading.
Gauge calibration issue: In some cases, the gas gauge might be improperly calibrated, resulting in it always displaying a full tank. Recalibrating the gauge might resolve the issue.
To address this problem, it is recommended to take the vehicle to a qualified mechanic or an authorized Dodge service center. They will have the necessary diagnostic tools and expertise to identify the exact cause of the issue and perform the required repairs. They may need to inspect the fuel level sensor, check the wiring connections, or evaluate the instrument cluster to resolve the problem.
This problem, is caused by a defective gas level sending unit inside the fuel tank. You must remove the fuel tank from the car to replace the level sensor.
You have a fuel level sending unit that is not working properly. It is located inside the fuel tank.
Also, when you ask for help with your vehicle it would be very helpful if you could mention WHICH "Legacy" we are talking about. It seems that Subaru got "stuck" on the Legacy name - there are actally 9 choices for "Legacy" just for your model year. (see list below) There are also 2 different engines available for that year a 2.2L and a 2.5L.
fuel gauges work using a variable resistor. Typically, when the fuel level is low, the fuel level sender is working at a high resistance. When the tank is full, the sender is working with a low resistance. Anything that increases the resistance in the circuitry will lead to a false low reading. Dirty or corroded wire terminals in the fuel sender circuit would raise the resistance. If you can remove the fuel sender unit from the tank, you can use an ohm meter to check its resistance. When the float is low, you should see a resistance of around 100 ohms. When the float is up (tank full) you should see a low resistance of about 2-5 ohms.
Mostly likely you have a tank mounted fuel gauge. If your vehicle is pointing down hill the guage goes up or down. It is usually the fuel level in the tank that makes the float go up to tell you how full the tank is, if fuel is sloshing around then level fluctuates. I would say that if it stabilizes on level ground and at a stop, and you can get a stable fuel reading then this is more of an annoyance than a problem. If you can get an accurate reading and you do not run out of fuel you may want to leave this one alone, you will have to drop the fuel tank and replace the fuel float on top of the gas tank which can be labor intensive as well as expensive.
You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.
On a C900, the fuel sender level unit is separate from the fuel pump
and located on the right side top of the tank, accessible by removing
the trunk floor lift up panel (the pump is located on the left side top
of the tank. Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.
Test
the resistance of the sending unit with the lines disconnected, the resistance should be
2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for
voltage across the top of the sender unit, if no voltage, that's likely
the problem!
If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.
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