The fuel gauge and the overhead console do not read right and they go up and down . One time they might read full and then the next time they read empty and you just filled it up. I was told that a new fuel pump assembly should fix it. Well after many dollars spent it still dose the same thing. Thanks for any ides that my help.
Tank sender/ sensor problem more that a fuel pump
run the fault codes
SOURCE: gas gauge reads empty but tank acts like it's full
I also have a 04 with a 1.8L. same problem. I took the fuel regulator off. It is a black box behind the rear tire under car. It only has 2 bolts to take off. After that there is a couple of vent hoses from the tank going to this box. Unplug them and 1 electrical connection. The electrical connection and one vent is connected to a T connection on the box that you can unplug by twisting on the T. Take that T off and look inside where you unplugged the hose on this T. There is a spring and a little plunger inside this tube. The plunger gets stuck. I took a little screw driver and some PB blaster and worked that plunger back and forth a couple dozen times and it unfroze. Put it back together gassed up just fine. I did not look but I was told regulator can be replaced for 200$. But a can of blaster is cheaper.
SOURCE: My 2000 Chevy Impala fuel gauge reads empty.
sending unit on fuel pump is bad, the sending unit shorts out gauge will go to empty or full, never read right, turn on switch ,it goes to full or empty, ,check the pump,hope this helps,thanks robert b.
SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full
Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.
SOURCE: help me to locate the fuel filter and fuel pump in the kia sedona
start of at the gas tank look under neath there are some black lines running towards the engine follow it to a small gold color that ataches to the line you are following that is the filter the pump is in the gas tank you need to drop the straps at the tank to bring it down
the blue part covered in the pic is the sender unit for the fuel gauge. 
use a old tooth brush not new as this is to harsh, and clean the strips on the sensor you can take this part off to clean all parts are just clipped on.
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