I attempted to start my engine after I filled up at a gas station. When I put the key in and tried to turn it wouldn't, so I flipped the key to the other side and it turned. The engine cranked, but did not start. Then I turned it again and it started.

Also be aware that overfilling (topping off) fuel tank can cause raw fuel to enter the EVAP system and flood engine upon attempted re-start - immediately after refill. Engine *cranks* ok - but will not start .. Holding accelerator pedal to floor may help. IF problems persist - seek *hands-on* diagnosis from qualified personnel. Good luck!