people were theiving fuel when fuel was a buck a gallon. it's not going to change anytime soon.
The one I like is the one where they use the line tap and drain the fuel by the cross over line.
OVM can't put an alarm anything on a fuel cap, not a DOT thing. the potential for a fire hazard is too risky according the same people who insist we have orange seatbelts.
As for removing one, I seen one that was well built and rather impossible to remove. It even had a round key tumbler.
By that same note, I'd be happy to see them do a little redesign on the tanks, period! One that would make it next to impossible to siphon out fuel.
if you loosen the fuel line from the tank,its faster getting fuel out than sucking it out with cyphin.Locking cap wont stop that.Small dogs bark at everything,lots of falty barks.If you want to keep that fuel,just dont stop,but if you have to,buy wife a cot,and have her sleep next to truck
I just ordered some of the anti- sipon insets at www.fueltankaccessories.com; I will post on how they work and the cost.