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Re: fuel guage is working right
A common problem is the fuel level sensor in the fuel tank. The tank would have to be removed and the fuel pump removed to replace the sensor. There is also a wiring harness that is a common cause for this. It is under the van and gets damaged by water.
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To confirm if the fault is with the Rheostat float within the fuel tank or the fuel guage in the dashbboard, you can remove the wiring to the fuel tank float. If the guage reading changes- to full- then the guage is good and the fault can be a jammed rheostat which can be removed from the tank and replaced after draining the tank. The guage can be tested on the outside with a ground wiring to the plate of the fittings and as the float is moved the guage must show a change in reading. if not the voltage must be measured to confirm the working of the guage.
These usually have large tanks, although the guage is attached to the fuel sending unit located in the gas tank. Essentially a level in the tank that tell the guage where the level of fuel is. I would start with the sending unit, usually sold with the fuel pump.
The gas guage does not have its own fuse but instead gets its power from the "integrated power module" that handles power delivery to the entire instrament cluster and beyond. If the guage is in-op,[doesnt work] then you will need to have a few "hands-on tests run to verify if the sending unit in the tank[fuel pump module] is functional or if this problem lyes else-where, wiring problem, bad ground,ect,ect.. One hint would be if the low fuel level l;ight still functions without the fuel guage working,then your problem is NOT in the tank and very likely is in your dash-electrical or faulty guage.
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.
It is most likely your fuel level sending unit has gone bad. It sits inside your fuel tank and uses a float similar to that uded in your toilet to tell the fuel guage how much gas you have in the tank.
In many cases, the unit can be accessed for replacment by removing the rear seat and opening the access port (3-4 screws) and removing the sending unit from the top of the fuel tank. It looks like this...
The level sensor is bad. They are easy to do. You don't have to pull the fuel tank down. There is an acsess hole in the trunk. Look in the rear of the trunk at the rear of the seats. You will notice there is a spot in the middle that the capet comes together, Pull them apart and there is metal plate with some 10mm nuts, pull that off and your fuel pump is there, remove and replace the sensor.
Also there will the a code in the pcm. you will need to clear it to pass emissions
Your needle moving from empty to full and then back to empty indicates that it is trying to set itself (most cars do this each time they are started). So, yes, there seems to be a problem with the sending unit that feeds information to your gas guage. Prior to cracking open your fuel tank, you might try tracking the wires from the back of your guage as far as you can towards the tank. Then track the wires from your tank as far as you can toward the guage. Watch for damaged wires and/or loose connections as you go.