Would an anti siphon valve on the fuel tank help?

[IT Cowboy]

I am back with more paranoia about leaks but this time I think it might be a bit more justified. I park my truck inside the attached garage and am concerned about a fuel leak or the possibility of a fuel leak especially if I would be away for a few days. I am considering putting an 3/8 anti-siphon barbed and clamped valve in the fuel line where is exits the cab under the truck.

The backstory that made me think about this is that a year ago when I changed the fuel pump I left the truck sitting overnight in the drive and I left the fuel pump feed line disconnected. Longs story short I didnt cap it off or pinch it enough and it popped open during the night and drained 5 gallons of fuel on the drive. I am sure it did that from the lack of air break in the line and it created its own siphon and drained the fuel.

Now the reality is the chances of a clean break like that and not a weep or drip are very slim and especially while I am away. I could also just put a shutoff valve in there but I would need to turn it off and on each time I drive the truck

Any ideas or thoughts here. Am I being overly cautious or is there an easier and more reliable solution.