Hello! The fuel gauge on my 2007 Avensis 1.6 is stuck on the full tank position since the last time I topped up the tank, however the on-board computer seems to be accurately informing the car's autonomy as I drive. What could be the problem and how cheap/expensive is it to get it fixed? If I don't fix it straight away, could this cause further problems? I can monitor the fuel level by the on-board computer (I don't get why it can calculate how many miles are left on the tank when the gauge can't read the fuel level). Please help! Thank you.

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:

1. 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.
2. 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.
3. 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.
4. 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.

Fuel sender unit could be faulty and showing a full tank all the time. Basically the gauge is a volt meter and the float arm adjusts the voltage going to the fuel gauge when it moves up and down. If it's stuck for some reason it'll show full when it's at the top.

A local garage or auto centre can fix this easily or if you're good with spanners, it's usually located under the rear passenger seat where you can find the access to the top of the tank.

float may be stuck up;Take tank unit out and check it with power on and observe the travel and relative gauge position.

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.

Hello and welcome to FixYa!

The fuel float can be stuck at full position that's why it indicates full all of the time. I strongly suggest that the fuel float be replaced. It is located at the top of the fuel tank. You may need to pull down the fuel tank to gain access to the float.

Hope this helps and thank you for using FixYa! Have a good one!

It sounds like the fuel sender is bad in the fuel tank.

Remove the sender wire from the fuel tank and short it to ground (metal part of tank).

If the fuel gauge goes to full then your sender unit is faulty and replace it.If not ,please come back to me .

Please leave positive feedback if you feel I have helped you.

Thank you

When gauge is pegged at full, usually means a bad ground. Check wires at fuel tank, wiggle around, maybe one came off. The bad news is it is hard to get to without removing the tank. Sometimes you can reach arm in and get to them. Also check body ground at read of van.

You've got to check the( Fuel-gauge) sender unit which is inside the tank,
it could be faulty or stuck at 'full' position.
Its mostly fitted on top of the fuel tank could be easily accessable form the inside or you may have to drop the tank.

This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge