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My check engin light keeps coming on i had it check they it could be the fuel cap took cap off put back light gose off i was that the line may have a leak

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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.

Posted on Apr 03, 2015

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Check the fuel lines under the car. Don't actually start the car though, just turn the key until you hear the fuel pump turn on. This will load the fuel system and you will be able to see leaks (or sprays) under the car because of the pressure. If there are no leaks, see if the car runs perfect with a full tank of gas compared to a low tank. It should drive good turning left, but it might **** turning right or after a sudden stop. This could mean you have a crack in the seams of your gas tank or that your fuel pump is going bad (or a little of both).

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Nov 12, 2009 | 2006 Saturn Relay

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My guess is you have a leak either in the fuel tank itself or in the plumbing from the cap down to the tank. Have you ever been in a wreck?

When fueling the vehicle, do you see any gas leaking out under the vehicle?

Does the area where the gas cap screws in have any damage that would allow a leak to occur?

Another area to look at is the system that recycles gas fumes back to the gas tank.

Something is not allowing the tank to hold pressure.

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The fuel tank and lines is a pressurized system that is monitored by the computer and will set a emission code if there is a leak or you fill your tank with the vehicle running. 

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