Question about 2002 Chevrolet Corvette

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Gas gauge was reading full after fill up,then after a few miles read empty, and message center reads low fuel yet tank is full

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  • Chevrolet Master
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This issue sounds like a sending unit issue, in the tank. test that.

Posted on Sep 07, 2010

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6ya6ya
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Posted on Jan 02, 2017

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Fuel gauge is not reading properly 2006 Mercury Mountaineer


Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.

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sounds like a faulty sender unit or your just realy low on fuel before you spend any money on repairs try filling the tank up with fuel as if its been low for a long time the sender unit in the tank may be sticking the fuel will lube it and may start working again

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Fuel gage showing half a tank but trip computer only registering 60 miles left


Its very simple. If the gauge is showing half full then fill the tank and see how much fuel it takes. If the amount you add is approximately 50 percent of the fuel tank capacity then you know the fuel gauge is accurate . In that case the computer is giving an inaccurate reading and should be ignored. All you need is an accurate fuel gauge - it does not matter a row of beans what the computer says if the fuel gauge is reading correctly.

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Why does my 2002 SC430 gas gauge needle not work when tank is full?


The sending unit in gas tank is broken - hence the wrong readings of how much gas is in the tank. Replace unit.

Nov 14, 2012 | 2002 Lexus SC 430

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05 LR3 w/ 96,000 miles. Fuel Gauge dropped to empty on a full tank and gas light came on. Fuel Gauge is not reading at all anymore, just reads as empty. What parts do I need to fix this? Sender...


Repair is a major job involving dropping the fuel tank, a messy and dirty and dangerous job. It will take you at least one full Saturday to do this job if everything goes right and you have the proper parts. My free advice to you is to fill your tank every 200 miles and forget about the fuel gauge.

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1 Answer

At the start of the engine, the fuel gauge reads empty. i know for sure the gas tank is filled up with a decent amount or its full. after afew miles, the gauge slowly moves to its proper reading. i know...


Most cars and truck nowdays show the tank empty when you start it. Then it slowly advances to the correct level of fuel in the tank. You can try and use some fuel additives like Gumout or Valvoline that clean the injectors and other fuel sytem parts. You can get a buildup of tarnish in these parts and this can cause slow readings. If this was the case it should improve after a few tank fulls of gas with the cleaners added. The guage could also slowly be going bad. The newer style guages are connected to the fuel pump and you will need to replace the whole unit if this goes out on you. Keep in mid that when the fuel pump quits, it quits, usually without much advance notice. If the car starts sputtering and does not have full power, this will hint at the fuel pump going bad. If your car has over 100,000 miles on it, you might want to think about preparing to change the fuel pump, these seem to want to go out shortly after 100,000 miles, but you can get lucky once in a while and it can last longer. Keeping your tank at least half full with clean gas is a big help, the gas keeps the fuel pump cool so it last longer!

Nov 16, 2010 | Chevrolet Blazer Cars & Trucks

2 Answers

Fuel gauge not working all the time.


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

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2 Answers

Fuel Gauge reads empty, but tank IS full


the float in your gas tank seems to have water in it....water is heavier than gas, that's why gas floats on top of water....try putting something like HEAT in it to dry up the water in your tank....

Feb 03, 2009 | 2006 Isuzu Ascender

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