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On some vehicles, a sensor connected to a floater, much like the one in your toilet, measures the level of fuel in the tank based on its position. Similar to an electric slot-car track, the resistance of electricity in the lever determines the speed, or in this case, the level of fuel. So, what happens is, the resistance of electricity moves the guage on your dashboard in a near-accurate ratio with the level of gas in your tank. In your case, it appears the wires are connected backwards due to one of three problems - a factory fault, bad grounding in your dashboard, or crossed wires in your guage assembly connectors (check both ends). If your vehicle still has a warranty on it, you might want to take the dealer up on this one and claim you don't understand anything about cars (if you modified any of the vehicle's systems in any way). Else, a fuel pump, wiring correction and testing, and reassembly of your fuel system could cost upward of $600 at some shops. Typical dealer costs range around the $450 area, but an hour of your time, a multimeter, and about a gallon of idled fuel, you can figure this one out on your own. OEM (Original Equipment Manufacturer) fuel pumps costs anywhere from $69 to $200 depending on your vehicle, application, and equipment arrangement because some fuel pumps are actually inside the gas tank! This is something anyone would need to know first; prior to disassembling a fuel system and wasting a cartoon-filled Saturday morning! Josh Sugar Land, TX

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โˆ™ 2005-03-01 19:35:05
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Q: Why would a 99 4Runner fuel gauge read empty when full then flip when the fuel level goes down?
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Related Questions

Why does Gas gauge read empty at full and full at empty?

I would assume that the wires are hooked up backwards


Would it be correct to write My gas gauge read E?

It would be better to write: My gas gauge reads empty. Note that 'gauge' is singular, so it needs the singular verb, reads. If you had several cars all with gas gauges that read empty, then the verb would be read.


Why would a gas gauge jump around and most of time read empty?

Fuel level sender (in tank) faulty. If replacement doesn't correct fault, check sender wiring back to instrument for poor connection. Finally, replace gauge.


Why would the fuel gauge slowly go to empty when you apply the brakes?

Because the gas in being forced to one side of the tank and the sensor that reads the fuel level is reading a lower level as gas gets sloshed around.


What would make your fuel gauge move?

On a car, there is a float inside your gas tank. It is attached to a switch that sends the empty.....full signals to your fuel gauge.


Why would the gauge read empty when the gas tank is half full?

Most Likly a fuel sender problem


Why would fuel gauge read empty when the tank is full on a 1997 Buick Park Avenue Ultra?

have an experience mechanic test you fuel pump fuel level sensor, which is part of the fuel pump, ground the wires and if the gauge pecks gauge is good. if it don't you have to replace your cluster which is a seal item and must be replaced as a unit. do not try this yourself.


Why would a 1990 Mazda rx7 convertible manual begin to stutter and stall when the gas tank gets to the 12 full level?

your fuel gauge is probably bad. You are probably empty when it says 1/2 full.


Need to know if there is a fuse or for fuel level gauge reads correct level but goes back to empty every couple mins then back to correct level and where would it be located?

You must have a 1998 or newer truck. There is no FUSE for the fuel level gauge. Now there is a fuel leveling sensor on the sending unit that is inside of the fuel tank and that is what controls your fuel gauge. It is common for the sensor to get coated with suffler that is in today's fuels / Gas. You will have to remove the FUEL LEVELING SENSOR That's in the fuel tank and REPLACE it with a new one from the Chevy dealer.


Why would your gas gauge be on quarter tank but really be empty?

The fuel sensor in the gas tank is bad and needs replaced.


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Faulty signal sender in the tank.


Is there a chemical that would unstick your Nissan fuel tank gauge?

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What would cause the fuel gauge to show empty when tank is full and cause a no start condition?

You need a new fuel pump


Why would the gas gauge in a 99 Chevy Malibu LS say full when empty?

The fuel sensor in the gas tank is bad.


How can you use fully empty in sentence?

I would not use "fully empty" in a sentence because it is redundant and unnecessary. If something is "empty", it's empty. You do not need to say "fully empty" because empty cannot be anything but nothing. There is no further defining words needed.The glass was empty.I carried an empty pitcher.My gas gauge read E for empty.


Why would the Brake Warning Light on a 1992 Toyota 4Runner be showing on and off but even when it's on its never as bright as when the emergency brake is set?

I would suspect low fluid level. If the fluid level is ok, then have the brake system inspected.


Why would the Fuel gauge not work 0n a 1998 frontier?

Either the sending unit in the tank quit, orthe fuse blew, if the gauge is at the extreme empty or full, that could be a faulty ground somewhere on the system


What if your fuel light comes on and you know the gas tank is almost empty however the gauge reads almost half full?

i would recommend getting gas when that happens. perhaps take it to the mechanic to fix the gauge


What atoms would lose three electrons to empty its valence energy level?

Al (Aluminum) can lose three electrons to empty its valence energy level. Chemistry is the science of matter and the changes it undergoes. hope this helps! :)


What would cause 2004 Malibu fuel gauge to jump back and forth between empty and full?

a bad sending unit in the gas tank.


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if its computer orientated i would disconect the battery for 20 minutes


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i have a 1991 sovereign xj6 and i have the same problem, BUT the gauge would show correct levels when accelerating


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Yes, it can. You would have to find a way of shutting it off though.


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Example sentence - The gauge indicated the propane level was low and more would be needed soon.


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I would guess on the passenger side near the firewall. This is the location of my 2000 4runner.