Gas Overflowed After 2 Gallons When Gas Gauge Showed One Dot

Discussion in 'Prime Main Forum (2017-Current)' started by AlohaPrius, Aug 13, 2019.

  1. AlohaPrius

    AlohaPrius Junior Member

    Joined:
    Sep 5, 2004
    3
    8
    0
    Location:
    Honolulu, Hawaii
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Advanced
    Hope I'm in the correct forum. Apologies if not.
    My 2018 Prius Prime gas gauge showed one dot remaining.
    After filling two gallons, the gas began spilling on my foot.
    Put in one more gallon before I could see it was going to overflow again.
    So stopped and went home to query this Forum.
    This is the second time I've tried to fill the tank since I received it in April, first fill-up was no problem.
    Am I doing something wrong? Any suggestions welcomed!
     
  2. schja01

    schja01 One of just a few in Chicagoland

    Joined:
    Apr 22, 2005
    915
    574
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    WAG:The anti-siphoning valve is malfunctioning. Get the dealer involved as this could be a safety issue on top of the inconvenience.
     
  3. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    4,171
    3,196
    0
    Location:
    New England
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    There have been several threads on PRIME or Gen4 Prius having problem accepting gas. It could be defective valve as schja01 suggested, but it may also be simple mechanical malfunction. In most case, if you close the gas cap and lid and go back to the car and push the gas lid open button under the dash again, it will reset the valve and should take full capacity of the gas.

    Read this thread describing this phenomenon. Fuel Filling Problem | PriusChat
     
    #3 Salamander_King, Aug 14, 2019
    Last edited: Aug 14, 2019
  4. schja01

    schja01 One of just a few in Chicagoland

    Joined:
    Apr 22, 2005
    915
    574
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    The OP says several gallons was/were accepted before the overflow so whatever happened took a while so I'm withdrawing my antisiphon valve malfunction and am now going with the filler handle was up against the door switch and didn't initially trip the switch until after a few gallons flowed. (all one sentence my 5th grade English teacher would chastise me for that)
    Waiting for the OP to report back.
     
    jerrymildred likes this.
  5. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    4,171
    3,196
    0
    Location:
    New England
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    FWIW, 2020 model has modification on the fuel lid switch which prevent the accidental push to signal the lid being closed while fueling. I couldn't find the thread showing picture of the new switch with guard on it. OP's car is 2018 PRIME so it has no guard around the switch as shown in the pic on here: Fuel Filling Problem | PriusChat
     
  6. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    6,043
    7,623
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I'll chime in too. It was almost certainly the door switch. The nozzle handle shield bumped the switch partway into the fill-up and closed the valve in the tank. Only way to finish filling is to hit the fuel door opening button on the dash again. I've read enough stories about it here that, so far, I haven't done that but I can see how easy it would be. Especially when I only get gas every 2-3 months.
     
  7. Blauer Glimmer

    Blauer Glimmer Active Member

    Joined:
    May 2, 2009
    445
    167
    0
    Location:
    NY (Southern Tier)
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    I will be refueling soon for the first time in 3 months. Hope I can avoid bumping the switch. What does it look like?
     
  8. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    4,171
    3,196
    0
    Location:
    New England
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    See the pic in this thread. the pic on here: Fuel Filling Problem | PriusChat
     
    Blauer Glimmer likes this.
  9. AlohaPrius

    AlohaPrius Junior Member

    Joined:
    Sep 5, 2004
    3
    8
    0
    Location:
    Honolulu, Hawaii
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Advanced
    Successfully filled my 2018 Prime this morning! Yay!
    Thank-you all for your comments. I panicked when the gas overflowed onto my feet. Got home and remembered PriusChat probably has the answer.
    And special thanks to Salamander_King's picture. My first reaction to someone mentioning a "switch" was, "What switch?"! Picture was worth a thousand words!
    Phew, I can relax today. Thanks again!
     
  10. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    4,171
    3,196
    0
    Location:
    New England
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    FYI, I found the thread showing new and improved fuel door switch with a guard. For the 2020 model, accidentally hitting the fuel door latch to activate door closed signal before fueling is less of problem.

    See the pic here: Problems refueling | PriusChat
    The 2019 and earlier model pic is on my comment before the linked one for comparison.
     
  11. schja01

    schja01 One of just a few in Chicagoland

    Joined:
    Apr 22, 2005
    915
    574
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    The splash guards/vapor recovery dodads around here could have a problem with that.
     
  12. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    14,066
    6,074
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    In the photo previous, the latch switch was having a problem with them.
     
  13. Mendel Leisk

    Mendel Leisk Obtuse Angler

    Joined:
    Oct 17, 2010
    35,078
    23,975
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Would this be a "design fail" by Toyota, something so finicky and easy to mess up? Particularly being a serious safety and environmental concern.
     
  14. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    4,171
    3,196
    0
    Location:
    New England
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Yes, it is. That's why Toyota fixed it for 2020 models. They should recall earlier models to install the "guard" as shown in the pic the pic here: Problems refueling | PriusChat
    The 2019 and earlier model pic is on my comment before the linked one for comparison.
     
    Mendel Leisk likes this.
  15. MikeDee

    MikeDee Senior Member

    Joined:
    May 9, 2013
    1,005
    350
    0
    Location:
    San Francisco Bay Area
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    This problem must not affect the vapor recovery nozzles used in CA, as I've not had the problem on my 2017.
     
  16. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    14,066
    6,074
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    The vapor capture systems of new cars are at the point that the systems on the pump aren't needed.
     
Loading...