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    Strange glitch with fuel gauge

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    So I'm wondering if anyone else had experienced a similar issue.

    When I started my car to leave for work yesterday morning my low fuel chime and light came on and I watched my miles to empty display begin to drop from 55 to 46, 34 to 23, etc, all the way down to 0 and finally ending with just a dotted line across the display. Now when I last parked my car I still had just under a half tank and I've never let my fuel run below a quarter tank so seeing this was quite alarming. I shut the car off and checked underneath to ensure there was no leaks (there weren't) and then called my wife to turn around and come pick me up to take me to work since I didn't have time to get the gas can and go to the gas station and back home to fill the car up. I'm now thinking that someone syphoned my gas overnight but figure I'll deal with it when I get home since I need to get to work.

    Once I got home from work, I went to the gas station to fill up my 2 gallon gas can and go back home to dump that in the tank. I start the car up and the fuel gauge needle goes right to the 3/4 mark and I'm thinking WTF? I then drive my car to the gas station to top off the tank and it only takes about 4 gallons to completely fill up. So obviously I experienced some weird bug in the system and have no idea what caused it. My ST is a 2014 with approximately 42,000mi on it.
    2014 Performance Blue Fiesta ST
    Stratified flash tune
    Cobb - RMM
    ModBargains gas pedal spacer
    Pierce Motorsports 2pt traction bar
    FSWERKS short shift and solid bushings
    Mishimoto OCC
    MAPerformance intake
    Depot Racing FMIC
    CFM Symposer delete
    Boosted Designs Deadpedal
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    FSWERKS cat-back exhaust

  2. #2
    Member 230 Rep Points Krug's Avatar
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    Odd! Not something that I have experienced with my ST.

    I believe that for most vehicles the most common cause of fuel level gauge issues is the sending unit in the tank. Our car, like most modern cars, has it integrated to the fuel pump assembly. If it happens again, I would say it's either that or a software glitch.

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    Strange glitch with fuel gauge

    It is indeed strange. What I see when I either disconnect the battery or flash a tune is the MPGs start initially going down from whatever value it starts to about 16 mpg and then, with driving, it gets back to normal. Same happens with the predicted range (miles to empty) - it jumps to over 400 miles - and then starts moving down to realistic values.

    The fuel gauge never had any difficulty. And as far as the predicted range goes, if it is in the normal regime, it tends to be quite accurate, and - what I particularly like- it counts down to zero. None of this “low range” or dashes nonsense.

    What did the fuel gauge actually show when you saw the mte numbers go down?
    Stage 3 2015: Cobb FMIC + APort&Tuner + Cobb RMM + Ingen CAI + ATP charge pipe + 2JR catless DP + 3" inch Ingen exhaust/custom 3" flange for DP + Mishimoto Radiator + Mishimoto Oil Cooler : Sympozer delete : Boomba shifter bushings/short throw adapter : Wilwood Big/Brake Kits on all 4 corners and Timken rear hubs : Willwood Spec 37 slotted rotors; 4x100 bolting pattern conversion : Boomba Brake Cooling Deflectors : BC-2 Coilovers and Springs - 1" lower : TB Performance brace, crossmemeber and rear traction bar : NoPistons dead pedal : Euro smoked LED tailights : Strobe 3rd brake light :Rally Mud Flaps : Sanded front grille honeycomb : Auxbeam® 7" fog lights : Piercemotorsports front tow hook : SYNC 3 conversion with Android Auto/Apple Car Play : Rear view backup camera : Speed Dawg shift knob : JL Audio JX400/4D 4-channel amplifier : KICKER 11HS8 8" 150W Subwoofer : AudioControl LC2i 2 : Infinity 6-1/2 Inch Coaxial Speakers : Polk Audio Speakers : Schroth Rallye 4 ASM harness +...

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    The fuel gauge itself was buried past "E" which is why I assumed I was out of gas.

    Another weird glitch just showed up yesterday which may be unrelated but now when I start the car I get this loud tapping noise coming from under the plastic trim panel that covers the touch screen. It sounds like someone is smacking the underside of the plastic with a stick. It's a repetitive "tap....tap....tap....tap...." and does this about ten times. I'm going to pull the panel up this weekend and see if I can identify where the noise is coming from.
    2014 Performance Blue Fiesta ST
    Stratified flash tune
    Cobb - RMM
    ModBargains gas pedal spacer
    Pierce Motorsports 2pt traction bar
    FSWERKS short shift and solid bushings
    Mishimoto OCC
    MAPerformance intake
    Depot Racing FMIC
    CFM Symposer delete
    Boosted Designs Deadpedal
    Mountune Sport Springs
    FSWERKS cat-back exhaust

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    Member 57 Rep Points maestromaestro's Avatar
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    Quote Originally Posted by FastCoolBlue View Post
    The fuel gauge itself was buried past "E" which is why I assumed I was out of gas.

    Another weird glitch just showed up yesterday which may be unrelated but now when I start the car I get this loud tapping noise coming from under the plastic trim panel that covers the touch screen. It sounds like someone is smacking the underside of the plastic with a stick. It's a repetitive "tap....tap....tap....tap...." and does this about ten times. I'm going to pull the panel up this weekend and see if I can identify where the noise is coming from.
    This sounds like the blend door actuator. Very common failure. There are several threads on this subject.

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    Stage 3 2015: Cobb FMIC + APort&Tuner + Cobb RMM + Ingen CAI + ATP charge pipe + 2JR catless DP + 3" inch Ingen exhaust/custom 3" flange for DP + Mishimoto Radiator + Mishimoto Oil Cooler : Sympozer delete : Boomba shifter bushings/short throw adapter : Wilwood Big/Brake Kits on all 4 corners and Timken rear hubs : Willwood Spec 37 slotted rotors; 4x100 bolting pattern conversion : Boomba Brake Cooling Deflectors : BC-2 Coilovers and Springs - 1" lower : TB Performance brace, crossmemeber and rear traction bar : NoPistons dead pedal : Euro smoked LED tailights : Strobe 3rd brake light :Rally Mud Flaps : Sanded front grille honeycomb : Auxbeam® 7" fog lights : Piercemotorsports front tow hook : SYNC 3 conversion with Android Auto/Apple Car Play : Rear view backup camera : Speed Dawg shift knob : JL Audio JX400/4D 4-channel amplifier : KICKER 11HS8 8" 150W Subwoofer : AudioControl LC2i 2 : Infinity 6-1/2 Inch Coaxial Speakers : Polk Audio Speakers : Schroth Rallye 4 ASM harness +...

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    Well that's just fantastic.....
    2014 Performance Blue Fiesta ST
    Stratified flash tune
    Cobb - RMM
    ModBargains gas pedal spacer
    Pierce Motorsports 2pt traction bar
    FSWERKS short shift and solid bushings
    Mishimoto OCC
    MAPerformance intake
    Depot Racing FMIC
    CFM Symposer delete
    Boosted Designs Deadpedal
    Mountune Sport Springs
    FSWERKS cat-back exhaust

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    Quote Originally Posted by FastCoolBlue View Post
    Well that's just fantastic.....
    You're in a big company for the actuator. I'm on my 3rd one at 70k miles. Apparently, it's a consumable.

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    Stage 3 2015: Cobb FMIC + APort&Tuner + Cobb RMM + Ingen CAI + ATP charge pipe + 2JR catless DP + 3" inch Ingen exhaust/custom 3" flange for DP + Mishimoto Radiator + Mishimoto Oil Cooler : Sympozer delete : Boomba shifter bushings/short throw adapter : Wilwood Big/Brake Kits on all 4 corners and Timken rear hubs : Willwood Spec 37 slotted rotors; 4x100 bolting pattern conversion : Boomba Brake Cooling Deflectors : BC-2 Coilovers and Springs - 1" lower : TB Performance brace, crossmemeber and rear traction bar : NoPistons dead pedal : Euro smoked LED tailights : Strobe 3rd brake light :Rally Mud Flaps : Sanded front grille honeycomb : Auxbeam® 7" fog lights : Piercemotorsports front tow hook : SYNC 3 conversion with Android Auto/Apple Car Play : Rear view backup camera : Speed Dawg shift knob : JL Audio JX400/4D 4-channel amplifier : KICKER 11HS8 8" 150W Subwoofer : AudioControl LC2i 2 : Infinity 6-1/2 Inch Coaxial Speakers : Polk Audio Speakers : Schroth Rallye 4 ASM harness +...

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    Guest-only advertisement. Register or Log In now!
    Here's the longest of the threads on the blend door subject...
    https://www.fiestastforum.com/thread...l=1#post337266

    Re fuel gauge, haven't run across any similar posts. I wonder whether there are any codes stored in the system?

    Were the roads wet when this occurred? Run over anything in the past hundred miles?

    Did you get the characterstic 'ding' when it initially showed as low?

    Is there anything about the vehicle that isn't stock, or has been worked on?

    I believe that is the evap charcoal canister, underneath the rear of the vehicle; no fuel runs through it. But the photo shows where the fuel tank is, and the wire harnesses that feed it. I'd inspect for damage or oddities.

    2016 Ford Fiesta ST Kona Blue ; Engine, Suspension will remain untouched ; Southwest Ohio ; Winter: 215/45R17 Continental ; Seasonal: 205/40R17 Bridgestone

 

 

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