I wouldn't be surprised with these finicky machines. I'm just hoping it stays screwed down

I've done this on a bunch of other cars I've had and never had problem. It's a (bad?) habit I picked up from being in the military.

Yep, when it clicks off...stop.

There is a port/tube that connects to the filler tube from the evaporation system and when you keep fueling the vehicle (after it clicks off)...you are essentially dumping fuel down that port into your evaporator system...which renders the system unless and usually throws a diagnostic code.

Brian.

Most military equipment is EPA exempt...so, emission systems are deleted (nonexistent). You may run into some emission systems on the stock light duty vehicles running around base (chevy, fords, etc), but militiary grade/battle ready vehicles would be exempt.

Especially, the diesel engines nowadays...couldn't imagine them holding up a battle...just so the operator of the vehicle could do a regen on the emission/DPF system...lol.

Thank you, for your service. Granted, if you were in charge of filling up the light duty vehicles...the mechanics in the motor pool probably hated you... they were probably like...why in the hell are all of these damn check engine lights always on...lol.

Brian.

It is often 'blowback' from overfilling that causes the fuel to escape via the breather but in truth the breather should not overflow externally. Don't overfill the fuel tank as the truck won't go any extra appreciable distance in any event but it wastes the fuel spilling onto the road when you drive away.