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Old 02-20-2014, 08:48 AM
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Inconsistent Fuel Gauge Reading

Hello all,
I've noticed after two different fill ups, I noticed that my fuel gauge isn't quite reading accurately. It'll hold on FULL until about 50 miles and then drop to 3/4 tank and then 1/2 tank at 100 miles. When I fill up at a half tank, it only takes 10 gallons of fuel to top it off. At first I thought I was getting crappy fuel mileage but thankfully, that isn't the case.

I've put Diesel Kleen (grey bottle) in it on the last fuel up as I read on a different forum that it helped correct the issue, but I'm still experiencing the problem. Thoughts?

**Also, on a side note, I have another question that I've read mixed answers to. After shutting the truck off, there is a buzzing clicking sound (almost like a pump cycling) for about 15 seconds and then quits. What exactly is it? My truck is an 04 6.0L. Not sure what firmware the FICM has.

Thanks!
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Old 02-22-2014, 07:37 AM
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Anyone??? I was told this is the place to be to get the best advice and help. Don't let me down now. Lol
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Old 02-22-2014, 08:25 AM
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by "top it off" do you mean the handle clicking off or do you fill the neck all the way up?

It sounds like it could be a bad sender.

The noise is likely the injector cycling
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Old 02-22-2014, 09:03 AM
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Thanks! Ya, from half a tank it only takes 10 gallons until the pump handle clicks off. I never fill it clean up the tube. Is the sensor located in the tank?

As for the sound, I've read somewhere that there is a new heat inductive flash for the FICM that eliminates the buzzing after the truck is turned off. If so, I might schedule a time to take my truck to the dealership and pay the $100 to get it updated.
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