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Fuel guage does not register correct amt of fuel. constantly going back and forth

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It moves back and forth even if its at a half a tank when i take off it goes to full and when i slow down it goes to e

Posted on Oct 29, 2008

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When my fuel tank is full the guage registers empty


Could be a problem with the gauge in the instrument cluster, or the wiring that goes back to the tank, or the sending unit in the tank.
The sending unit has a float much like your toilet which could stick or fail to move.

Jan 24, 2013 | 1994 Dodge Grand Caravan

1 Answer

Fuel guage reading was erratic. Replaced fuel pump and sensor..fuel guage then read a constant 1/4 tank lower than it actually was. Mechanic checked and said it was wired wrong...fuel guage then read...


Thanks for choosing FixYa and welcome. You may have a bad sending unit. It could also be a defective dash voltage regulator, lost ground at sending unit, break in the wire at the dash harness too. It can be anyone of these to be honest.

May 05, 2011 | 2001 Isuzu Rodeo

1 Answer

Fuel pump runs constantly with key on engine off. pulled fuel pump relay and fp fuse on firewall and pump still runs and engine will run. pulled guage fuse in dash and pump quits. reconnect fuel pump fuse...


Gauge fuse runs a fuel module that is installed to correct vapor lock. This module is what is running the pump. This module, called the hot fuel module is mounted on the passenger side behind the dash above the blower motor.

Jan 23, 2011 | 1989 Chevrolet K3500

3 Answers

Gas gauge is not registering level consistently . level changes up and down. i fill gas tank up and it will go down to a3/4 of a tank fairly accuratly then gets erraic, going to full and back 3/4 very...


sounds like its time for a new sendinding unit, this is the part that hold the fuelpump inside the tank, and has a float arm, this is what tell you how much gas is in the tank, heres a picture of it,this comes with everything even the pump,also make sure to wire in the new connector,these trucks have connector problem,good luck.also check the ground that go to that connector, follow them,may go to rear frame on the leftside, remove and clean them.d2f4ba0.jpg

Apr 07, 2010 | 1999 Chevrolet Blazer

1 Answer

Temperture guage goes from 180 to 260 and bounces back and forth. The service engine soon stays on constant. The check guage light goes on and off when the temperture goes red line.


The check engine light is operating correctly as the computer reads a spike in temperature range in the engine. Your problem is more than likely a bad thermostat. I have seen times when a bad or loose radiator cap would cause the same symptoms. If the radiator cap has been removed recently it could be that it is just not on correctly. Make sure you check this only when your engine is cold. Hope this helps you out

Feb 06, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

2006 envoy gas cap won't tighten and the fuel gauge reads empty on fill up and fluctuates back and forth.


You can just replace the gas cap...However about the fuel guage fluctuates back and forth...thats due to the sending unit, which is located on the fuel pump itself

Jan 19, 2010 | 2006 GMC Envoy

1 Answer

Gas guage is not working


If there is gas in the tank and it is not registering correctly, then the sending unit or power to sending unit is bad.

Sep 16, 2009 | Volvo 740 Cars & Trucks

1 Answer

Gas guage-oxygen sensor?


The oxygen sensor has nothing to do with the fuel gauge. There are two possibilities for the gas gauge error, first it could be the in-tank gas level sensor or it could be a defective stepper motor which drives the gauge. A professional scan tool can determine the fuel level being sent by the in-tank sensor, if that disagrees with the gauge, then the stepper motor needs replacing.

Sep 04, 2009 | 2005 GMC Envoy Xl

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Fuel gauge doesn't register correctly


The fuel gauge sending unit is in the fuel tank in a module along with the fuel pump, and float guage. It sends an electronic signal to the fuel guage on your dash. When it becomes worn or the float may even have a leak in it, the unit sends incorrect info to your guage. The solution is to empty your fuel tank, drop it from the vehicle, remove and replace the entire module.

Jul 04, 2009 | 2000 Ford Expedition

2 Answers

Gas Gauge not reading correctly


The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.

Jan 11, 2009 | 2004 Ford Explorer

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