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Thread: 'Check Fuel Cap' warning lamp stays on

  1. #1
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    Lightbulb 'Check Fuel Cap' warning lamp stays on

    Started this morning after driving approx. 5 miles. Aftermarket locking cap on as snug as ever. Riding around on teeth jarring washboard roads recently. Any thoughts?
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
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  2. #2
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    I have had this issue on different cars with aftermarket locking caps. Sometimes you have to just take it off and put it back on again. See if that works.

  3. #3
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    I think you can use your sct programmer to resent the light. Then see if it returns.

  4. #4
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    Probably the cap. Use the original cap unless there is a problem with gas theft in your area.
    “When you can’t make them see the light, make them feel the heat.”
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  5. #5
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    Reset fuel cap - no change. 'Check Engine' lamp came on this afternoon, followed by periodic 'erratic idle' - no stalls, but close. Left at local repair shop here in SC - reputable and appears to be well equipped. Service Writer - Dispatcher had never heard of a 'Mercury Marauder'(?!?!) but was impressed otherwise. Shop was advised: 'Do NOT reflash ECM'. Know something tomorrow. Won't be home until early next week at the soonest.
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

  6. #6
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    Thumbs up

    Picked up car: Canister Purge Solenoid replaced. Running well again with a steady, semi smooth idle (good). Before the last malfunction, the car would alternate between a 'nervous' idle (lean trim) and the normal 'semi smooth' idle. I'm happy again.
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

  7. #7
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    OK, I'm asking for a reason...was it the Canister Vent Solenoid or the Canister Purge Valve? (they are 2 different things...one's in the engine compartment and the other's in that tray under the trunk)
    The Blackbird
    Trilogy #61
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    The Spruce Goose
    2004 Grand Marquis LS Limited Edition
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  8. #8
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    Arrow

    Quote Originally Posted by RF Overlord View Post
    OK, I'm asking for a reason...was it the Canister Vent Solenoid or the Canister Purge Valve? (they are 2 different things...one's in the engine compartment and the other's in that tray under the trunk)
    From the RO:

    Parts: Vapor Canister Purge Valve

    Labor: Replace Canister Purge Solenoid
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

  9. #9
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    I'm having an EVAP issue with my 2004 Grand Marquis and was hoping they would be more accurate in describing which piece they replaced...oh well.
    The Blackbird
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    The Spruce Goose
    2004 Grand Marquis LS Limited Edition
    Daily Driver

  10. #10
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    Arrow

    Quote Originally Posted by RF Overlord View Post
    I'm having an EVAP issue with my 2004 Grand Marquis and was hoping they would be more accurate in describing which piece they replaced...oh well.
    Shop is closed weekends. I will contact them monday and report back. Judging by what I was charged, the 'purge valve' was changed out - heck of a markup too. I'll find out for sure monday. Motorcraft device depicted.



    https://www.carid.com/motorcraft/vap...7&url=12770410
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

  11. #11
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    Yup, that's the Purge Valve...lives on the firewall, passenger side. Ford officially calls it the Vapor Management Valve, but yeah...that's not the Canister Vent Solenoid.

    Thanks for clarifying.
    The Blackbird
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  13. #13
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    Thumbs up

    Quote Originally Posted by RF Overlord View Post
    Yup, that's the Purge Valve...lives on the firewall, passenger side. Ford officially calls it the Vapor Management Valve, but yeah...that's not the Canister Vent Solenoid.

    Thanks for clarifying.
    Learned something today. Didn't realize there were two electrical devices involved in venting the fuel fumes on modern cars. Still recall the singluar vacuum operated 'canister purge/vent valve' on early emissions controlled cars.

    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

  14. #14
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    This is from the 2004 OBD System Operation Manual from Ford:

    "First, the Canister Vent Solenoid is closed to seal the entire evap system, then the VMV is opened to pull a 8" H2O vacuum. If the initial vacuum could not be achieved, a large system leak is indicated (P0455). This could be caused by a fuel cap that was not installed properly, a large hole, an overfilled fuel tank, disconnected/kinked vapor lines, a Canister Vent Solenoid that is stuck open, a VMV that is stuck closed, or a disconnected/blocked vapor line between the VMV and the FTPT."

    P0455 is what I'm getting.
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  15. #15
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    Lightbulb

    Quote Originally Posted by RF Overlord View Post
    This is from the 2004 OBD System Operation Manual from Ford:

    "First, the Canister Vent Solenoid is closed to seal the entire evap system, then the VMV is opened to pull a 8" H2O vacuum. If the initial vacuum could not be achieved, a large system leak is indicated (P0455). This could be caused by a fuel cap that was not installed properly, a large hole, an overfilled fuel tank, disconnected/kinked vapor lines, a Canister Vent Solenoid that is stuck open, a VMV that is stuck closed, or a disconnected/blocked vapor line between the VMV and the FTPT."

    P0455 is what I'm getting.
    The 'diagnostic tree' would be most interesting. Don't know when evap controls first incorporated electrical devices but this is the first time ever I've had an issue with one.
    Current Garage:

    2005 Mustang GT Premium
    2019 Ranger Lariat Super Crewcab 4WD
    2015 Triumph Trophy SE



    “You've gotta dance like there's nobody watching,
    Love like you'll never be hurt,
    Sing like there's nobody listening,
    And live like it's heaven on earth.”
    William W. Purkey

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