When I traded in my 08 I had no plan of getting my 2010, stopped by dealer "just to look around". I had just filled tank up and had no intention of giving them free gas. I could pick up my new truck next day so I went home to siphon out most of gas and for the life of me I could not get it to go.
Is there something in the filler tube that prevents this anyway? I tried for over an hour but no gas, dealer got 7/8 of a tank.
2012 XLT Screw 5.0L 4x4 w/gotts mod, mirror reflectors to turn signals/marker lights, Trail FX window vent shades
Extang Trifecta Signature Series Tonneau
+1 on the locking fuel plug. As for thieves punching the tank, there are aftermarket skid plates just for preventing this from happening, as well as keeping rocks and other stuff from hitting the tank while off-road.
Risk of siphoning would actually be less with no cap at all as the capless system requires that the hose would have to be exactly the right size to hit the releases on both sides to open the flap. With a cap system you just unscrew it and use any size hose you want. But yea, anyone who really wants your gas would just puncture the tank most likely.
2010 F150 Lariat Screw 5.4L 4X4 3.55 LS rear end 6.5' bed with side bedsteps, Sony sound w/Touchscreen nav, loaded. Mods/Addons: AliArc Grill Guard, Stampede bug deflector, EGR window shades, Ezee down tailgate assist, Amp Research tailgate bed step, Mirror reflectors to turn signals, Truxedo Deuce cover, Underseat storage box, Recon Extreme Scanning Tailgate Lightbar, Gotts mod, LED Smoked Tails, LED Lighted F150 Door Sills, 24" Helos