The easiest way to get the gas is to pop the inspection plate on the deck above the fuel level sensor. Five easy screws and the fuel level sensor is removed and the gas is right there for the taking any method the thief prefers. No defense whatsoever.
If you suspect you are missing some fuel........pop the inspection plate above the fuel level sensor and make sure everything is still buttoned up.
FYI: You guys probably already heard about the guy who was stealing 1000 gals of gas at a time from gas stations. If not, he had a covered trailer with a skirt around the bottom on the outside and a big hole cut in the bottom on the inside. Also inside was 1000 gal tank, some hose, and a high speed pump. He would position the trailer over the same fill ports that the gas tanker uses. The guy inside the trailer would reach down through the hole in the bottom of the trailer, open the fill port and start pumping. The driver would pop the hood on the truck and pretend to have engine trouble. They even had one theft incident on video that showed an unaware deputy Sheriff offering assistance to the driver (thief). Truly amazing. :shock: