I had to replace the filler tube on my Land Cruiser a while ago; I was momentarily puzzled why there were a couple of angled pieces of sheet metal tacked to the

I had to replace the filler tube on my Land Cruiser a while ago; I was momentarily puzzled why there were a couple of angled pieces of sheet metal tacked to the lower tube interior. Then I realized that it would make it near impossible to get a hose of any significant diameter into the tank. I bet some Toyota engineer had to experiment for a while to come up with a solution which enabled the fuel to flow down the tube fast enough to avoid a diesel geysir - while still making siphoning impractical...