Gas gauge not accurate
Replaced fuel pump PO462 Code
Ordered sending unit and fuel level sensor..
My car has 97000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
I believe you are correct in your diagnosis in that the problem is likely related to your fuel tank sending unit sensor. This is almost always the most common culprit of fuel gauge problems.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
The most common cause of an inaccurate or non-functioning gas gauge is a component called the sending unit. When you`re driving, the sending unit rubs against a variable resistor. This can lead to wear over the life of your vehicle.
An inaccurate fuel tank reading is most commonly caused by the sending system which reads the fuel tank level and sends the reading to the gauge. Issues can also stem from a bad gauge, blown fuses, or corroded wiring. You can self-test all of these parts at home with a few tools.
The most common problems found on the 2010 Dodge Charger include excessive engine noise, alternator failures, and slipping out of gear while driving. Overall, these problems are similar to other sports cars, and repair costs are a bit more affordable than rivals.
Press and hold the “Trip/Odo” button and turn the car back on. While you`re holding the button, turn the key back to the “ON” position. Hold the button down for another 2 seconds after the car`s back on, then release.
Turn on the engine`s ignition and probe with a multimeter between the ground and the positive terminal on the back of the gauge; it should be marked with a “+” or an “I.” If there is no voltage then the fault is in the ignition circuit—and the gauge is probably good.
The fuel level gauge can be custom calibrated to accurately display the output from any fuel level sender with an output between 0 and 270 ohms. 1. Make sure the fuel level sender is connected to the gauge and that the fuel tank is empty, or nearly empty, before proceeding.
A fuel gauge that reads full or empty all the time, or has a needle that moves erratically, could be the result of a faulty sender unit or fuel gauge itself.
Some sensors change how the engine behaves when it receives information from the control module. The idle air sensor, coolant temperature sensor and EGR sensor all change things within the engine and fuel delivery system.
They`ll charge you anywhere from $200 to $300 for the labor, assuming you bring the replacement gauge in on your own. The shop can get the gauge for you, but that will increase the total cost by anywhere from $300 to $1,000. Such damage may be covered by your car`s warranty, so be sure to check.
Considering the engine`s meager power output, fuel economy is a lackluster 18 mpg city/26 mpg highway and 21 mpg combined.
Your Dodge Charger can last as many as 250,000 to 300,000 miles by taking good care.
The fuel pump shut-off switch has a red reset button on top of it.
The switch will usually come with a reset button that will reactivate the fuel pump if the switch was tripped. The fuel pump switch is an electrical component, and just the same as the rest on the vehicle, over time it can wear out and develop issues.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Faulty gas gauge or sending unit?
This is a problem likely related to your fuel tank sending unit. This is a small float type component inside your fuel tank that measures the level of the fuel inside the tank. As the fuel level drops, the float level changes and sends a signal to the car’s computer which then displays the reading on the fuel gauge in your dash. If you need assistance with this, I would recommend having an expert from YourMechanic come to your location to diagnose the issue and repair your fuel sending unit as necessary.
the lights on my dash board do not work and my gas gauge always says its empty with the gas light on even though i fill up my tank
Hi. It sounds like your instrument panel cluster or IPC needs to be rebuilt or replaced. Over time, the bulbs eventually burn out as do the bulbs in your lights at home. The gauge’s movement is controlled by an electronic stepper motor that receives input from the sensors. More often than not, the signals are good, but the stepper motor no longer moves. This can be checked with the use of a high end scan tool that has functional testing of each gauge within the IPC. If the needle doesn’t move when commanded, then the stepper motor is bad. Consequently, if the needles don’t move when commanded, the sensor or wiring is bad.
I suggest having a qualified technician, such as one from YourMechanic, inspect the electrical components in your vehicle to see what is occurring.
When refilling gas tank, gas overflows before tank is full.
The most common cause of this type of problem is when the fuel filler neck’s inner tube comes off of the neck itself. You will need to have the filler neck removed to check to see if the inner tube was knocked off from someone trying to get fuel out of tank with a siphon hose and managed to knock the hose off. This causes the tank to not get filled properly and the inner hose can get caught in the fuel sender causing wrong readings.
If you’d like to get this fixed, consider YourMechanic, as a certified technician can help you service your fuel filler neck and ensure that your fuel gauge functions normally. Good luck.
Gas gauge malfunctioning and Service Engine Light on
Thank you for asking about your 2006 GMC Sierra 1500 HD. More than likely, the problem is the fuel sensor, which is built into the fuel sending unit. This assembly is mounted in the gas tank. This is a common problem with vehicles like yours. Symptoms include incorrect fuel gauge readings and an illuminated Check Engine Light. I recommend having a professional, such as one from YourMechanic, inspect this problem and replace the fuel sensor if necessary.
installed a stereo but blew a fuse going to the lights on my dash board gauges (speedometer, gas gauge, rpm, etc).
The best thing to do is check all the fuses. It is entirely possible you have blown more than one fuse as well some fuses supply power to other fuses. I rarely look up the location of a fuse in an information system as this sort of information has a high rate of inaccuracy. Most vehicles will have a panel that labels each fuse anyhow. This will always be far more accurate. If you find any blown fuses, no matter what they power, replace them.
The best way to test a fuse is with a test light. This will enable you to check them all quickly. Spade style fuses have metal exposed on the back side that you can quickly test them without removing them one at a time.
Often times, fuses will power multiple systems. If you suspect the tail lights are not working, simply test them. If you should replace the fuses and it blows again, disconnect the stereo and see if the problem persists. Definitely double check the supplied wiring diagram with the stereo and I strongly suggest getting a hold of a factory diagram for your car so you can make sure you are indeed connecting to the correct circuits.
If you should need further assistance, I recommend having an expert inspect the electrical system for you in order to pinpoint the right fix.
I have a 2000 Buick Century and the gas gauge goes up and down
You’re guess of the fuel sending unit is a good one. The sending unit is a variable resistor, that changes its internal resistance according to fuel level. This information is then sent as an input to the powertrain control module (PCM), which shares this it with the instrument cluster over the communication bus. The sending unit is part of the fuel pump and the two must be replaced as a unit. To determine for certain whether the sending unit is at fault, I recommend having your vehicle’s gauge inspected firsthand by a professional.
Temperature gauge does not work – 1998 Mercury Grand Marquis
You will need to test the computer to scan for data of the temperature sensor to see if the computer is reading the correct temperature as tested externally on the coolant sensor. If the sensor is not accurate then replace the sender. If the sender is accurate then you will need to have the temperature gauge replaced.
Gas gauge isn’t working. Sometimes the speedometer and the temperature gauge doesn’t work. Limited lights around gauges and radio.
Hi there. The dashboard lights are burned out in the dash and the dimmer switch could be worn causing the lights to be weak. The gauges that seldom fail to work is most likely a loose wire in the dash panel. The fuel gauge that is not going to E when shutting off the car has a damaged rheostat within the sending unit. The sending unit is in the fuel tank attached to the fuel pump. If you need further assistance with your gauges not working, then seek out a professional, such as one from Your Mechanic, to help you.