Fuel gauge (gas gauge) malfunction.

[Pappy]

I think my issue is different than most people are interpreting what is really going on. I filled up my truck and the gauge stayed on 3/4.

See if the information on page 90 of the owner's manual is of any value.

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[RocktMtnWay_406]

I have tried these methods and am currently in the testing phase. I should be at about a half a tank and that's about what my gauge is currently reading I'm going to go fill it up tonight. One thing that I haven't done in the past which could be causing an issue is sometimes I do not shut my ignition off when I fill up.

 

[maxx075]

I have tried these methods and am currently in the testing phase. I should be at about a half a tank and that's about what my gauge is currently reading I'm going to go fill it up tonight. One thing that I haven't done in the past which could be causing an issue is sometimes I do not shut my ignition off when I fill up.

99% certain that's your issue.

 

[banker505]

With a 18.2 gal fuel tank at 16.7mpg it should say about 300 mile range. When I full up it says 255. Been driving for a few days now it says 196 and the gauge hasn't moved yet

 

[maxx075]

With a 18.2 gal fuel tank at 16.7mpg it should say about 300 mile range. When I full up it says 255. Been driving for a few days now it says 196 and the gauge hasn't moved yet

This must be one of the biggest misconceptions about these trucks.

Your DTE calculation is based off of ~15.5 gallons of fuel & your current MPG reading. If you reference your user manual (shocking I know, why would anyone do that?!) you will see that you have ~2.7 gallons of fuel reserve, i.e. once your calculated DTE reads 0.

SOOOO, doing the math for your reading here (18.2 gallons TOTAL - 2.7 gallons RESERVE) = 15.5 gallons USEABLE.

15.5 USEABLE gallons x 16.6MPG = 257.3 miles, which is right about what you said it was showing.

 

[banker505]

Thanks for clearing that up for me...appreciated.

 

[RocktMtnWay_406]

Update: Issue resolved itself after I did the "reset/calibration" method. I've run several tanks through it and all seems fine.

 

[Yotota]

I have tried these methods and am currently in the testing phase. I should be at about a half a tank and that's about what my gauge is currently reading I'm going to go fill it up tonight. One thing that I haven't done in the past which could be causing an issue is sometimes I do not shut my ignition off when I fill up.

99% certain that's your issue.

Update: Issue resolved itself after I did the "reset/calibration" method. I've run several tanks through it and all seems fine.

Glad it's better. Definitely turn the ignition completely off when you refuel. In addition to the fuel gauge and mileage calculations resetting, the EVAP system can also get really angry if the truck is powered on and the gas cap is removed.

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