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Vapor locking ...try a new cap
assuming you have a screw on plastic locking gas cap you could use a large pair of channel lock pliers to squeeze the sides in and turn it, if it is metal this will damage the cap.
Being broken off, and turning the cyclinder into a rocket..
If you are locking your car before trying to take off the cap, this is the problem. The cap won't come off if the car is locked.
Drill an 1/8" hole 1/2" from the edge of the cap. Insert an ice pick or smaller drill bit through the hole and into the ring on the inside. It should lock the two parts of the cap and you should be able to twist the cap off without damage. You can continue to use the cap, so your "check engine" light will not come on until you can purchase another. I have used the method on Jeep caps, and it is posted on other forums. Others have responded that it has worked flawlessly. ---------------------------------------------- No, no. DRILL A HOLE? I wouldn't chance the buildup from heat from a drill coming into contact with explosive gasoline vapors. Instead, use some elbow grease and simply pop the freaking top of the cap off. The lock will come out along with it. Then take some pliers and turn the cap until it comes off.
Because your gas cap is loose. Tighten it and the light will go off.
Most likely, your gas cap or the o-ring on the gas cap is bad and is not sealing properly. It could also simply be that you do not have the gas cap on tight enough.
Turn The Gas Caps Until It Comes Off?
Any vapor leak from the fuel system can cause a "gas cap" light.
i have replaced my gas cap twice on my 2004 grandprix and the lcheck gas cap lights goes off for about two weeks and comes back on what could this be
Gas caused by fermentation.
Turn your engine off, check the gas cap and restart your car. If that doesn't work, be more specific about which car you have or check your owners maunal.