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Re: gas gauge works than doesnt than works again
This is the sensor in your fuel tank, they have little brushes on them that run on a reostat. it is a common problem, I have been able to remove them and fix them, although the best option is replacement.
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I do not own a pacifica but I do know quite a bit about cars and the digital read out gets in info from the gas gauge. so if the gas gauge is incorrect so will be the read out. I would start at the sending unit for the fuel gauge I bet you will find your problem there. The sending unit is most likely located in the gas tank
The reason the guage is staying at empty is because it has set a code for a fuel level sensor. This car has 2 so it could be either one, or a wiring issue (unlikely). When you disconnect the battery, you likely either clear the code or reset it as not current so it allows the gauge to work for a short time until the code sets again. Have it scanned and I am sure you will find a code likely P2066 or P2068 for the level sensors.
Though these systems may be unrelated, there is one universal possibility that I can think of. This sounds like a problem with the electrical grounds throughout the truck.
Clean and tighten the ground cable on the battery, and make sure that the ground wires are tightly connected to the frame and engine block. After that, make sure that the ground connections for the systems you described are in good shape, and tightly connected.
As far as the gas gauge level goes, it sounds to me like it could be the float ball system that is inside of the gas tank, which is connected to the fuel pump.I dont think your guage in the dash is broke, but i could be wrong. Sounds like something in the fuel pump area
It sounds like your fuel sender unit is definately faulty,im not to familiar with chrysler but remove your backseat bottom just **** up where you would sit in the back and remove (not hard takes some muscle though) and see if you have an axcces door to get to the fuel sender unit on top the fuel tank ,the axcess door will have a wire harness going thruogh it and prob has some glue like material just peel door off then unplug connector to fuel sender unit remove bolts and replace make sure the float goes back in exact pos came out ,,,,if it doesnt have axcess under rear seat then yes tank will have to be pulled out and shop prob best suited to do the job