The tank is not venting properly.
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If you mean service engine light, then take off the gas cap and put it back on correctly. The fuel system is pressurized, if the cap is not on tight the check engine light will come on. At least three clicks.
Disconnect fuel fill hose. Remove skid plate [gas tank shield , 2 bolts on tank straps and lower tank some, disconnect 2 fuel lines [special tool] unplug elect. conn. at top of tank. Lower tank to ground. With brass punch [no sparks] tap lock ring counter clockwise [to the left] remove and tilt fuel pump out of tank...reinstall in reverse. Or cut a 8.5'' square hole above fuel tank behind rear seat...make access panel for next time...save your back...and armpits from filling up with gas! 23 gal tank full of gas is heavy.
blowback is caused by adding fuel to fast. the filler neck is not large enuff to allow air from the tank to escape as fuel is being put in tank. remedy this by filling fuel tank slower.you can also drive onto a wooden block with wheel closest to tank filler. this tips vehicle and helps air escape
The Malibu might have a problem with the vapor canister. If the canister is clogged up the fuel tank will not vent right and the car will be hard to start.
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