Why is the check fuel cap light on - 2006 Mazda Tribute

Fuel cap is part of the emission system. If is not put back on correctly your light will come on. Removing and installing correctly will cause the light to go off. Make sure cap is secure each time you fuel up. See if that ends the problem. If not try a new cap.

I assume you allready checked to see that cap is on straight/ tight. right?

remove cap and look at it's base sealing ring (O-ring) it's sort of a brown color or white if it's missing , squashed flat anywhere or just don't look right (loose fitting) replace entire cap with new

this year car has what is called a dead space fume return system where by the dead space (area in fuel tank not submerged in gas) has a hose connecting it to intake manafold for reason of burning off fuel vapors and not allowing them to exit into air (air polution) helps your fuel econ as well maybe something bad with that ?

Sorry, but there is no "sensor at the fuel cap". Therefore, there is no code that says "sensor at the fuel cap". There is, however, a Diagnostic Test Code (DTC) That indicates a possible problem with the fuel cap.
(HINT: When you want information on codes, it is usually wise to include the code number that you are getting - that way, it can be looked up, instead of GUESSING at what the problem is from a code description that some generic code reader is telling you..)
DTC P0457 is defined by SAE J2012 as "Evaporative Emission System Leak Detected (fuel cap loose/off)"

At this point, I am ASSUMING this is the code you got.

This DTC is set when the Powertrain Control Module (PCM) detects that there is an in-tank pressure drop that is more than 7in. H2O within 30 seconds directly after refueling, or there is excessive purge (fuel Vapor) flow more than .06 lbs. per minute. Possible causes are:
> Fuel filler cap not installed after refueling
> Fuel filler cap loose or cross-threaded

There are other malfunctions that can also cause this code to set, but it will be accompanied by other codes indicating other possible failures.
If there are no other Evaporative Emissions System codes present, then there is most likely a problem with the way your fuel cap was put on the last time you got fuel.

Check your fuel cap and make sure it is on correctly and is tight.

this is normal, you should not have engine running when re-fueling, fuel gauge moves very slowly if key is on while fueling, turn key off and then on and should read proper level.

Hi:
The check fuel cap light is tripped when your cap has been loose or off, and the engine is running. Often you need to have the light reset by a code scanner. If you have checked the cap and it is secure, if you reset the code and it comes back, you possibly need a new gas cap.

The evaporative emissions system uses a vaccuum pump to check the fuel system to make sure that fuel vapors cannot escape into the atmosphere. If you leave fuel cap loose the computer will detect it and set a computer code and turn on the check engine light. If the cap is tight and the light still comes on, you may have other problems. Hopefully your vehicle is still under warranty, as evaporative emission system leaks can be very difficult to locate and repair, even for the dealership mechanics.

Have you checked your fuel cap? A loose or leaking fuel cap will trigger an EVAP code. I would start with a new fuel cap, and have your local autozone, or checker, or automotive store clear the check engine light after you replace the fuel cap. Hope this helps

was the CEL on and fuel cap light on before you had the fuel pump replaced? if it was after the repairs were performed, double check all evaporative emissions lines, hose, and connection on and around the fuel tank. also make the the fuel filler neck is properly seated and clamped to fuel tank. if all good, check the plastic fuel filler top (just behind fuel door, where you put fueling nozzle) make sure it is not chipped or cracked anywhere. especially where the rubber seal from the cap rides.

are you fueling car with engine running? sounds like it is seeing an evap system leak. cannot fuel with it running. also check your gas cap

Good Day,

Probably just a bad seal in the cap. You can purchase a new one from any auto parts store or dealer. Just make sure they cross-refrence the new cap to your car as diffrent caps have diffrent pressure ratings, and you wanna make sure you get the right one. And yes a faulty cap can cause your check engine light to come on as the fuel is not pressurized properly for the motor. Once the cap is replaced with a new one remove your negative battery terminal for a few moments, then re-connect this will clear you check engine light. If you don't do this you engine light will stay on forever.

Good Luck
Hope this helps