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Fuel gauge discrepancies


Best Answer acdii , 22 January 2014 - 02:53 PM

Source of discrepancy found!  I finally got around to documenting the trip screen prior to shut down and after startup.  

 

When I got to work this morning, I took a picture of Trip 2 moments before shutting the car off so I would have a record of run time, and fuel used.  I had forgotten to take the picture, so I started the car without the brake being pressed, so reason for CEL. 

 

1502811_662214680487336_1215283833_o.jpg

 

When I went out to lunch, I had remote started the car, called my wife to let her know I was on my way to get her, then noticed the snow on the car and proceeded to clear the snow. By the time I got in the car ready to start it(did not check to see if it would start without pressing the brake(sorry different thread)), it had been running for at least 5 minutes or more.  I had the camera ready and as soon as I pressed the button, and the screens cleared, took another picture.

 

1606491_662214683820669_500781596_o.jpg

 

So it appears that remote start run time is not accounted for, nor is fuel used during that time.   This would explain the gallon and a half difference between what the trip said was used and what was actually put in, and also explains why the fuel gauge and DTE doesn't correlate with reported MPG.   Going back to the PDF posted in another thread on how the Fuel gauge is used, this makes perfect sense now.   It doesn't explain why an apparently empty tank only takes 11 gallons, which I still believe is just a calibration issue between the fuel sender and the PCM. 

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27 replies to this topic

#1 OFFLINE   acdii

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Posted 31 December 2013 - 09:24 AM

This is a sore subject for some, and I noticed this morning a HUGE discrepancy on mine. I had filled up yesterday, put in 1.2 gallons more than the trip said I used, and the gauge was in the RED. It only took 10.64 gallons to first click, second click added.2 gallons.  According to the pump, it was full to the top. This morning though, only having put 66 miles on, the fuel gauge was down 3/8ths from full.  By my rough estimate that is 4.5 gallons of gas used for 66 miles. 13.5 gallon tank, 1.5 gallon reserve would put it at 3 gallons per quarter. 

 

When I got to work this morning, trip 2 showed I had used only 2.5 gallons over 94 miles, but the fuel gauge was hovering over 1/2 tank.  Making an appointment for Saturday to get the oil change and tire rotation done, and will bring this up too. Wildly inaccurate!

 

 

1498089_650605288314942_795459356_o.jpg

 

 

I have no complaints about the MPG, its frigging COLD out sub zero temps, and getting 37 MPG is right on the money from my estimates, exactly what I expect to see, however, IF the gauges are off, then 37 is a pipe dream, If the actual fuel used is roughly 5.5 gallons, the car is only getting 17 MPG.  That is a HUGE problem if its true, then I will have an issue with MPG. I might fill up again today just to see how many gallons were actually used.  I have never had the fuel gauge go down that much on a work trip. 


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#2 OFFLINE   ptjones

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Posted 31 December 2013 - 05:29 PM

I'm wondering how level the car was when you filled up. Surprisingly the FFH fuel gauge goes down very quickly at the beginning as compared to CMAX's, but seems to stay in the center for quite awhile. Also I think it still had 1.5gal in tank  when it turned red. Also maybe the pump was super sensitive.  :) 

 

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#3 OFFLINE   hybridbear

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Posted 31 December 2013 - 06:01 PM

This is a sore subject for some, and I noticed this morning a HUGE discrepancy on mine. I had filled up yesterday, put in 1.2 gallons more than the trip said I used, and the gauge was in the RED. It only took 10.64 gallons to first click, second click added.2 gallons.  According to the pump, it was full to the top. This morning though, only having put 66 miles on, the fuel gauge was down 3/8ths from full.  By my rough estimate that is 4.5 gallons of gas used for 66 miles. 13.5 gallon tank, 1.5 gallon reserve would put it at 3 gallons per quarter. 

 

When I got to work this morning, trip 2 showed I had used only 2.5 gallons over 94 miles, but the fuel gauge was hovering over 1/2 tank.  Making an appointment for Saturday to get the oil change and tire rotation done, and will bring this up too. Wildly inaccurate!

 

I have no complaints about the MPG, its frigging COLD out sub zero temps, and getting 37 MPG is right on the money from my estimates, exactly what I expect to see, however, IF the gauges are off, then 37 is a pipe dream, If the actual fuel used is roughly 5.5 gallons, the car is only getting 17 MPG.  That is a HUGE problem if its true, then I will have an issue with MPG. I might fill up again today just to see how many gallons were actually used.  I have never had the fuel gauge go down that much on a work trip. 

Our car is doing the same thing on this tank. Trip Meter shows 4 gallons used but gas gauge shows under half a tank remaining...


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#4 OFFLINE   acdii

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Posted 31 December 2013 - 11:45 PM

Well filled the tank again today. Large difference again between the trip and actual. Nearly a 1.4 gallon difference.

 

1525154_650910181617786_1433739568_n.jpg

 

 

 

Thats a 10 MPG difference.


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#5 OFFLINE   hybridbear

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Posted 01 January 2014 - 08:10 AM

Perhaps the cold makes it more inaccurate...


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#6 OFFLINE   ptjones

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Posted 01 January 2014 - 12:18 PM

Do you think  it might be the amount of Ethanol in the gas?

 

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#7 OFFLINE   jmellen

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Posted 01 January 2014 - 12:39 PM

I read on another post elsewhere in this forum that the FFH actually computes the gas gauge reading shown on the left hand screen.  Apparently it does not use a sender unit like most vehicles.  The post stated that due to the shape of the tank that would not be a linear function anyway, which makes sense.  If the above is true it would take a little bit perhaps for your car to 'learn' the correct gauge setting.  I have found my gauge to be accurate but the amount reported consumed at fill up time on my trip odometer is almost always low by 5%.  I would be curious to know if anyone knows if there is a way to change the calibration of fuel consumed.  With so much computerized on the FFH I would think it could be adjusted programatically.  The Ford dealer did not know.


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#8 OFFLINE   hybridbear

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Posted 01 January 2014 - 02:44 PM

Here are my current pics. The DTE + miles driven add up to about 460 miles. At 40 MPG this is 11.5 gallons which is plausible with the car being slightly inaccurate and having a ~1.5 reserve when the DTE hits 0 miles. The level on the gauge seems low for only having used 52% of a full tank, but it seems like the car might have evened itself out now compared to what I noticed earlier in this tank.

 

8FF56BE5-6A32-4196-ADC9-E1EE0095B39C_zps939C620D-329B-4DA3-9B4B-86BF671F0F77_zps


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#9 OFFLINE   ptjones

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Posted 01 January 2014 - 03:08 PM

Interesting to see how it works out.

 

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Current Record:  12/30/2014  902.2 mi.  63.8 mpg  14.13  gal. (Actual GPS:  922 mi.  68 mpg  13.5 gal.


#10 OFFLINE   acdii

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Posted 02 January 2014 - 12:16 PM

I just noticed now that the fuel gauge in my last picture shows above the full mark. I rarely see that.  Oh well, it is winter, and a CoLd one at that. Not looking forward to monday when it will be a high of -9 and a low of -22 with a 22 MPH wind. 

 

Hey Canada, COME GET YOUR WEATHER!!!


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#11 OFFLINE   hybridbear

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Posted 02 January 2014 - 12:38 PM

I just noticed now that the fuel gauge in my last picture shows above the full mark. I rarely see that.  Oh well, it is winter, and a CoLd one at that. Not looking forward to monday when it will be a high of -9 and a low of -22 with a 22 MPH wind. 

 

Hey Canada, COME GET YOUR WEATHER!!!

Our Monday will be worse lol high of -15F and low of -27F...


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#12 OFFLINE   acdii

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Posted 02 January 2014 - 03:09 PM

4 degree difference. COOLLLLLLDDDDD BRRRR.


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#13 OFFLINE   corncobs

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Posted 02 January 2014 - 04:19 PM

Must be nice to have some winter weather. I can't wait to get back maybe we can grab some of the 40's F from around here and bring it with us.

Friends went by the our house today and FFH is turning on and running while the Explorer isn't saying anything anymore with a dead battery.
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#14 OFFLINE   FordService

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Posted 02 January 2014 - 09:28 PM

This is a sore subject for some, and I noticed this morning a HUGE discrepancy on mine. I had filled up yesterday, put in 1.2 gallons more than the trip said I used, and the gauge was in the RED. It only took 10.64 gallons to first click, second click added.2 gallons.  According to the pump, it was full to the top. This morning though, only having put 66 miles on, the fuel gauge was down 3/8ths from full.  By my rough estimate that is 4.5 gallons of gas used for 66 miles. 13.5 gallon tank, 1.5 gallon reserve would put it at 3 gallons per quarter. 

 

When I got to work this morning, trip 2 showed I had used only 2.5 gallons over 94 miles, but the fuel gauge was hovering over 1/2 tank.  Making an appointment for Saturday to get the oil change and tire rotation done, and will bring this up too. Wildly inaccurate! ...

 

acdii,

 

Let me know what your dealer has to say. I'll get your CSM involved if you still need help.

 

Ashley



#15 OFFLINE   Osofast

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Posted 03 January 2014 - 05:04 PM

Acdii, i have a very similar thing happening with my FFH also. I was computing that my mileage was around the same as your around 37 however it is taking more gas in when filling, than what the trip meter says has been used.
Im in Ma. and the cold weather started here about Nov. and it seems so did this problem.
I think it is an issue with the cold, winterblend gas/ethanol and expansion in the tank.
It seems much worse this year in the cold than last year since the "better fuel mileage PCM update in the summer".
I also believe there is still an issue with my car running cold, my commute is only 4.8 miles on a cold day i will remote start to let the car warm up in the driveway for 10 to 15 minutes and then drive to work outside temps ranging from 40-25 f by the time i get to work I'm just getting into the first line of normal temp on the gauge.

Edited by Osofast, 03 January 2014 - 05:06 PM.


#16 OFFLINE   hybridbear

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Posted 03 January 2014 - 06:28 PM

I also believe there is still an issue with my car running cold, my commute is only 4.8 miles on a cold day i will remote start to let the car warm up in the driveway for 10 to 15 minutes and then drive to work outside temps ranging from 40-25 f by the time i get to work I'm just getting into the first line of normal temp on the gauge.

Grille covers will help with that. Check out this thread.


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#17 OFFLINE   hybridbear

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Posted 03 January 2014 - 06:32 PM

Trip meter said 11.38 gallons used, but I put in 13.03 gallons

 

ET Mode DTE was down the lowest I've seen

36B854CB-8003-4D4C-9059-0CAC26E3F880_zps

 

ET Mode FLPM (Fuel Level Percent of Maximum) was the lowest I've seen too, 2.2% or .3 gallons

2BBB5518-7A9F-42A2-9D15-7B668A842E83_zps

 

After filling the tank the FLPM shows 99.5% or 13.4 gallons

91CC5117-4CCB-44D4-973B-2AD90280AA30_zps

 

We'll see how this tank does. The old FFH was never this far off in summer. Back last winter I didn't pay as much attention as now to know if it was inaccurate like this last winter.


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#18 OFFLINE   acdii

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Posted 04 January 2014 - 01:29 PM

It has been entered into the system for mine, so maybe something will come up with it.  My SM agreed that didn't look right either. Also mentioned I can never seem to put more then 10 or 11 gallons when its way past empty.


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#19 OFFLINE   ptjones

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Posted 04 January 2014 - 02:49 PM

I wonder if they can come up with a software fix ware you could put in actual gal. and it would adjust the numbers so they are closer after a number of fill ups :)

 

Paul.


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Current Record:  12/30/2014  902.2 mi.  63.8 mpg  14.13  gal. (Actual GPS:  922 mi.  68 mpg  13.5 gal.


#20 OFFLINE   acdii

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Posted 22 January 2014 - 02:53 PM   Best Answer

Source of discrepancy found!  I finally got around to documenting the trip screen prior to shut down and after startup.  

 

When I got to work this morning, I took a picture of Trip 2 moments before shutting the car off so I would have a record of run time, and fuel used.  I had forgotten to take the picture, so I started the car without the brake being pressed, so reason for CEL. 

 

1502811_662214680487336_1215283833_o.jpg

 

When I went out to lunch, I had remote started the car, called my wife to let her know I was on my way to get her, then noticed the snow on the car and proceeded to clear the snow. By the time I got in the car ready to start it(did not check to see if it would start without pressing the brake(sorry different thread)), it had been running for at least 5 minutes or more.  I had the camera ready and as soon as I pressed the button, and the screens cleared, took another picture.

 

1606491_662214683820669_500781596_o.jpg

 

So it appears that remote start run time is not accounted for, nor is fuel used during that time.   This would explain the gallon and a half difference between what the trip said was used and what was actually put in, and also explains why the fuel gauge and DTE doesn't correlate with reported MPG.   Going back to the PDF posted in another thread on how the Fuel gauge is used, this makes perfect sense now.   It doesn't explain why an apparently empty tank only takes 11 gallons, which I still believe is just a calibration issue between the fuel sender and the PCM. 


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