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Rikster, I almost sent you a PM because I didn't want to hijack the thread, but if anyone wants to know how I did it they will forever be guessing.
So...
When the tank was down and the filler neck was exposed, I simply removed the neck by removing the 3 screws near the cap holding it in place. Then I took a rotary tool like a Dremel to it with a tungsten blade like the one below.
I just guessed and widened the fill neck quite a bit and it was more than enough to accept the nozzle of the big truck pumps. I believe that the I.D. of the pumps is 1", so 1.25" should be plenty. Just keep going around and measure when you get bored/tired.
Then, be very thorough with flushing the neck out with water and letting it dry. I installed the Racor PS120 at the same time so I was not concerned about debris getting into the fuel system, but did a good job of rinsing the neck.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
