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Re: gas gauge dosn't work correct
But it works ok otherwise? Be happy, it's working then. No offense, but alot of vechiles when you fill it up full, and I mean FULL will read over full, and will stay there untill tank isn't overfilled. Since your drivnig a good fuel economy car, it will take several days.
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Since the guage moved, your wiring to your pick up is still good. Bad news is that if it doesn't move or moves all at once from full to 1/4, your float sensor is probably sticking or just bad. To clean or replace it would require you to drop the tank and pull the sending unit out. Sorry.
There is nothing else to replace ... presuming you did everything correctly and the replacement parts were not faulty, I suggest you live with it. Keep track of the miles you drive and fill up when you have driven about 1/2 the estimated miles per tank for best results. I.E.: you get 10 MPG - your tank is 20 gallons = 200 miles per tank ... fill up every 100 or so miles.
You could take it to the BMW place and let them fix it.
Does it stick at about half full? I would fill up, the gauge would show full then after 60-70 mile when gauge should show less than half to a 1/4 tank the gauge still showed 1/2 tank so I'd go ahead and fill it up. Finally, I watched my mileage and when my yellow low on gas light came on I filled it half full. After a couple of weeks I filled it up and the gauge has worked every since.
The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.
Either fuel sensor is bad or coated with sulfur residue from inferior gas. Try a can of Sea Foam gas treatment OR can of Techuron concentrate. Both available at auto parts and , of course, Walmart ! Add to full gas tank, drive 75 - 100 miles and see if all is well. If not, condide4 sensor change
Typical for concerns such as yours would be the sending unit inside the tank. In some cases, it would just be a connector that has been disengaged, loose or corroded, often however, it would be the internal float and the position sensor. A quick temporary workaround is to use carb/injector cleaner to be poured inside your fuel tank. It is intended to clean the fuel system from the tank to the injectors and in so doing also cleans the sensor. Of course the correct procedure would be to bring down the tank, remove the sending unit and physically clean the inside or replace.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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