[leo42.2875]

If your cylinder was fuel loaded, that would indicate a stuck open fuel injector. any top tier fuel should have enough detergent to maintain the injectors.

Were the injectors serviced to rectify the issue..??

 

[leo42.2875]

The injectors are pulsed by the ECU, so pressing the gas pedal with the engine off would not trigger the FI..

 

[leo42.2875]

...any idea then how cylinders could have gotten filled with fuel on their own overnight?

If your cylinder was fuel loaded, that would indicate a stuck open fuel injector. any top tier fuel should have enough detergent to maintain the injectors.

Were the injectors serviced to rectify the issue..??

 

[leo42.2875]

What about the testing, have you done an injector leak-down test ?