Question about 2000 Dodge Dakota Quad Cab

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Put in new float unit on fuel pump.gas gauge still not working

Gas gauge sometimes goes from emty to full then full to empty.when it hits empty low fuel light comes on.replaced the float unit on the fuel pump but the problem still remains. this is on a 2000 dodge dakota with a 5.9 ltr

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  • larryemotz Aug 02, 2009

    i did replace the whole level sensor with float attached.all wiring seemsand looks good.everything connected as it should be but gauge still still doing the same thing..

  • Anonymous Mar 13, 2014

    is there a fuel pump and a fuel sending unit is that were the float is located .So if my gas gauge goes from full to empty while driving does that mean the fuel sending unit is broke ?1991 toyota pickup v6 dlx

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Did you replaced just the float , because if the resistor that messures the level is not good you didn't do any thing you have to change the level sensor next to the pump..,Im sure that;s all the problem, you should also check the wiring next to the pumpand any connector down there

Posted on Aug 02, 2009

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Gas gauge 2001 pontiac aztek stays on full then goes to empty


The float on the sender unit is going bad. Will need to replace the fuel pump assembly.

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

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I changed fuel pump. Now the gas gauge does not work


year/make/model?? Does the gas gauge read empty or hard full? If it reads hard full, suspect a ground problem at tank. If gauge doesn't work at all, make sure there is power to the plug at the tank. It is also possible the float arm may have become disconnected as some of these units are tight to get back in the tank. I have also seen new pump/gauge assemblies with defective sending units resulting in non working fuel gauges.

Oct 12, 2015 | Cars & Trucks

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I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

Mar 23, 2013 | 1992 Mercury Grand Marquis

1 Answer

2003 Chevy S10 had fuel pump replaced. When fuel gauge shows slightly below half, the gauge falls to empty and low fuel lights blinks. What could be causing this?


hi,

sounds like the sending unit rheostat(sending unit) has a bad contact or break in the resistance wire. inside the tank theres a float attached to an arm that goes to a small rheostat, like a volume control on a stereo. the rheostat is sending a scratchy signal or no signal to the computer and your getting these readings. that part is inside the gas tank, the part usually comes integrated with the fuel pump. the gas tank has to be lowered to fix it.

jm

Jul 04, 2017 | 2003 Chevrolet S-10

1 Answer

Put in new fuel pump and sending unit. but my gas gauge doesnt always work. sometimes is does and sometimes it doesnt


if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump

Aug 11, 2012 | Cars & Trucks

1 Answer

Gas gauge goes full emty full emty gaugegenerly reads full but latly its up and down truck runs then wont


You need to test the gauge and the sending unit in the gas tank itself. In most cases I find this is the sending unit in the tank. Unfortunately, that is usually combined with the fuel pump in 1995 and newer vehicles which means you have to replace the whole unit. If you have 2 opening to your tank with wires coming from both you have a separate level sending unit from the fuel pump. If there is only one they are combined. Check for shorts on those wires.

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2 Answers

Gas gage read full when empty and sometimes emty


You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

Mar 16, 2010 | 2004 Pontiac Montana

1 Answer

When the gas tank is full the gas gauge shows as empty. When the gas tank is empty the gas gauge shows as full.


Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.

Jul 17, 2009 | 1999 Chevrolet Cavalier

3 Answers

2005 Buick Rendezvous Fuel Gauge


well the gage is made of rubber it could be sticking no other way than to replace the gage itself/ please rate my response thank you very much

Jan 31, 2009 | 2002 Buick Rendezvous

1 Answer

1989 Saab 900 low level fuel light


You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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