"check engine" light

[OtterbatHellcat]

Yes, your main electronic control module.

Remove the ground cable from the battery for several minutes...do not have your key (ignition) in the ON position for this.

Reconnect and start vehicle. If no engine light....drive truck around the block once or twice. If no light, I think you're good.

If the light comes back on, on restart or during your short test drive, the hard fault is set. I'd follow others advice at that point and get the actual code your truck has *somewhere* (auto store, etc) ...and Z has some solid advice about the filler neck if your light/code still exists.