Fuel gauge

This is common for the 2004 Pacifica and there has been a technical service bulletin (TSB) about the issue. The solution is to have the body control module (BCM) updated for the fuel gauge parameters. Talk to your local dealer about this TSB to schedule an appointment. the TSB number is 08-038-03.

Hey, a friend of mine has an 2004 Pacifica with just about the same problem. She took it to the dealer and mentioned that service bulletin, they did the work and it has not done it since.
Great site!

What would cause the gas guage on a 2004 Chrysler Pacifica to oscillate between full and empty every couple of seconds with a full tank of gas?

Inspect and test the fuel sending unit. Start here.

Gauge seems to work good above half tank, after that will drop drastically anytime even down to empty. Computer distance to empty changes with it and when it gets to 0 kms to empty will quit like it is out of gas even though it is not and even as little as a couple gallons of gas will take it back above half tank and running well again.

Sounds like a sender unit malfunction. It may have to be replaced as it is part of the fuel pump module.

Roy

The fuel gauge will be on half a tank then all of a sudden go to empty. The tank is empty and when you fill the tank it will only hold about ten gallons. The gauge reads full.

Hi.
It could be the float level unit in the fuel tank. It has a rheostat that can go bad and give you bad readings. The bad part is it is part of the fuel pump.

I am having the same problem here! It goes to half a tank and then drops to empty. I am wondering if there is an electrical problem and how the dual fuel pumps work. Like does one pump and then once you reach half a tank is there a relay that kicks the second pump on? I submitted an in depth question above, if anyone can help. thanks.

Six cylinder front wheel drive.

My gas gauge drops to empty when it gets to half tank. Sometimes the car stalls out when this happens.

Hi there,

You may have a faulty tank sender unit, when it stalls is it out of fuel or will it re start and keep driving?

Mark (mhpautos)

Whenever I am driving my car and if the gas gauge goes a little bit under half full the gauge will go all the way down to quarter of a tank when I know there is gas in the tank. When the tank is full it is fine, but when it moves under a half it goes down without coming back to its original position. Even when the car is turned off it will move up and while your driving it goes right back down.

Thanks for your help.

SD

Have the fuel sending unit checked out.

Thanks. What is the fuel sending unit?

The sender unit is in the fuel tank, it is a float attached to a variable resistance potentiometer, as the fuel level alters the float moves the potentiometer and alters the reading on the gauge.

My car has stalled out several times. The fuel gauge does not indicate the correct amount of fuel that is in the tank on the instrument panel. For instance, it will indicate 79 miles left until empty but the tank in fact be empty causing it to stall. Would this be a float or fuel sensor level issue or something else? Any help would be appreciated.

The gauge problem and the stalling problem could be two different things but I would like to advise you that running your car that low on fuel will ruin the fuel pump eventually. Right now you need to test the fuel pressure when this is happening to find out if you have a fuel pump problem or not. Replacing the pump unit will likely fix the gas gauge also.
Here is a link to an article from this site with step by step instructions and pictures explaining the process of checking the fuel system pressure, regulator and fuel pump in less than fifteen minutes:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator