Join Date: Feb 2014
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Inconsistent Fuel Gauge Reading
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.