Ok, since this is going nowhere, you guys estimate the min/max diameter that the explosion at impact had to be before we continue. Otherwise we're running around in circles.
Irrelevant, as I've already explained, and the only one running in circles is yourself.
However, as already indicated, any education is positive, so I shall answer the question anyway.
The explosion "at impact" would be sized according to the fuel distribution. At minimum, consider a case where the fuel was all contained within a volume equivalent to the wings of the aircraft. I'll let you research what the wing size is, since you need the practice. These figures are publicly available.
At maximum, consider the case where the fuel was in such a volume but scattered elastically at the moment of impact. The ground does not recoil, so the fuel can conceivably spread at the aircraft's former speed, but fanning in (potentially) all directions. The speed of the aircraft has already been presented to you from the FDR. For sake of argument, assume one second between impact and complete engulfment of the fuel (this time is an estimate, but there is
absolutely no way to predict just how long it took to ignite, or where). Multiply the speed by one second, and add it to each extreme of the first calculation.
Show us your answers, and we will see if they were computed properly. Expect answers for the first on the order of 10-30 meters, and > 300 meters for the second.