Exactly This!

Look at all the new Chevy and Ford vehicles that don't even have gas caps anymore.
They call it a capless fuel system. Our Camaro SS and my Sierra 2500HD are that way.
They just have a spring loaded "flapper valve" that opens when you insert the fuel nozzle.
I believe Ford is also using these capless systems.

No locking cap, or door.

If someone messing with fuel systems (car, truck, motorcycle) was such a huge problem it would be all over the internet.
You just don't see it.

 

The fuel filler door doesn't lock when the vehicle is locked? Or don't require a lever pulled inside the vehicle to open the door? My Honda and Ram doors lock when the car locks. The Chevy Malibu rental I had last week had a locking door. The Kia and Hyundai rentals I had earlier this year required a lever to be pulled. I can't think of any recent vehicle with a capless filler that just allow the door to open even if the car is locked.

Also, they are not without tamper resistance, as they ALL have anti-siphon mechanisms further down the filler neck. It is not just the flapper at the opening. That is also why they require the little funnel that has an elongated spout when you add fuel from a can - you have to open the anti-siphon mechanism with that long funnel.

 

No, the filler door does not lock nor is there any type of lever inside.
2017 Camaro SS and 2019 GMC Sierra 2500HD

And the Chevy Malibu is going away, with the last ones being built in November 2024

Don't have any experience with any other brands, but the seems to be the way the "industry" is moving too.

Yes, that is true as far as siphoning fuel goes.

I can see where this isn't possible with the HD fuel tanks, but then again I don't think fuel siphoning is much to worry about either.

 

Yeah, I know... work at a dealership...since you didn't catch my sarcasm, I added to my post

 

I regularly ride in Seattle. I have had things stolen off my motorcycle before. Therefore, I lock my bags. I have had someone pour enough crap into my tank on one of my KTMs that resulted in having the bike towed, and the fuel system dismantled and cleaned out. Did not blow anything up, but sure clogged up the works. I would rather avoid that crap.

Not putting a lock on as a standard feature makes sense. Not making a lock mechanism available does not make sense.

 

someone wants my fuel, take it. Someone wants to put sugar in my tank, do it. Their the ones playing with time