Question about 2004 Ford F250

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Gas cap check light - 2004 Ford F250

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Clean seal on cap & filler neck where it screws in, and make sure it's tight, erase codes & try again, if no luck, may need new cap.

Posted on Jun 26, 2009

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Gas cap indicaytor light came on. Changed cap and made sure it was tight but indicator light still comes on


The gas cap light is a generic light that indicates an emission problem. Usually a vacuum/pressure leak within the system. The gas cap is usually the first thing to check, however may not be the problem. There are numerous sensors and lines that control the vacuum/pressure/ of the fuel vapors and one of these is loose/disconnected/defective causing this light to come on. I would recommend inspecting hoses under the hood for any that may be loose/disconnected. You may also require a scan test to view sensor data to isolate the source of the light

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Check engine light and check gas cap


First, you have to have the trouble codes cleared from the computer memory to make the warning lights go off.
And the problem may be a leak in the gas tank venting system instead of the gas cap. The gas cap is the most often cause, but not always. You may have to get a shop to check for leaks.

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My check gas cap light and check engine light is on


CHECK GAS CAP COULD BE LOOSE OR MISSING OR LEAKING CAUSING EVAP LEAK IN WHICH WILL CAUSE CHECK ENGINE LIGHT FLASH ON..

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My check gas cap light is on but no check engine light came on


The check gas cap light was in response to complaints of the check engine light being on for loose/missing gas caps. So now when the PCM sees a large EVAP leak the first thing it does is illuminate the check gas cap light (on models equipped with the light). Since it doesn't know if the gas cap is on or not it can have other issues like a vent solenoid stuck open which the PCM would be unable to distinguish between that and the gas cap left off.

There will still be a trouble code in the PCM for the EVAP system.

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I'm getting gascap error and check engine light. What's causing the issue?


If you allready checked the gas cap and its on right.
Try replacing the gas cap with a new one.
You should here air wen you open the gas cap after driving
This is part of the emision controls and if it dosn't seal it will cause the check engine light to come on .

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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

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Replace the gas cap with stant locking gas cap. The locking gas cap provides security and quality.

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1 Answer

Light on my dashboard


ford taurus's are well known for this. the seal on the gas cap goes bad. before you replace the gas cap make sure when you close the gas cap you are turning it at least 5 clicks. if light stays on get a new gas cap. they are easy to install all you need to do is remove the gas cap.remove the gas cap strap. put ******** the new cap, close cap and turn 5 clicks. not clicking 5 time can set a p400 or p401 evap code causing the check enging /ses light to come on.

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1 Answer

Fuel/gas cap


have you replaced the gas cap? most of the time when a check engine light is on for the gas cap, its because the cap isnt venting the fumes properly or the cap isnt on tight enough.

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