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My 2001 aztek has a fuel guage malfunction most of the time it is stuck on full but the digital read out shows that i have used 7 gallons can this be the bcm or just a censor on the fuel pump
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Many cars do this to discourage gas theft. If the car fuel gauge only shows 1/4 full, a potential thief may not bother to steal 2 or 3 gallons of gas. This is very normal.
If the gauge is stuck on full and you are sure the tank isn't full, you have a sensor sending wrong information to the dash gauge. Most cars now have a single fuel pump and sending unit that can be replaced by a mechanic.
Digital gauge also gets its input for fuel level from a float in the tank. Here the culprit can be that float because the error is systematic i.e., full on empty and empty on full/half. If the reading was erratic then it was something to do with IC in the bars display panel.
you probably have a bad fuel level sensor in the fuel tank.you will have to remove the fuel tank to replace the sensor.the contacts on the sensor will break causing the fuel gauge to be inacurate.you can buy the sensor without having to buy the whole fuel pump assembly.
your problem is definately in the fuel sending unit..thats all it can be, either that or the float arm is losing contact on the slider... thats all it can be.
If you don't get offered a fix, this is a problem you can learn to live with.
Get used to filling the tank to the brim (that may not be so unusual in your part of the world - certainly is here, the way they tax fuel!) and resetting the trip counter on your dash every time you fill up.
For the first few times, fill up after a couple of hundred miles; note the amount of fuel it takes and the distance you've driven. Divide miles by gallons to get your average fuel consumption (average this over a few goes to get a reliable figure).
Find out from the user manual how much fuel the tank holds (if it gives several figures, the one you want is "useable" fuel). Multiply this capacity by the consumption you calculated earlier, and you'll get a very good estimate of the distance you can go before you run out.
Now all you need to do is to keep an eye on the trip counter, and remember to refuel every time you get to (say) 75% of your theoretical maximum distance.
This method has worked well for me over a number of vehicles, none with a particularly effective fuel gauge.
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