No, it goes the other way. 300 pounds of fuel would equal about 50 gallons, assuming 6 pounds per gallon (is kerosene heavier than water or lighter?). I just pulled that number out figuring that maybe 1% of the fuel in a tank wouldn't get used--maybe not pulled out due to insufficient pressure. That's just like saying that your car might have .15 or .2 gallons of gas left in it when the engine quits.
Well, in any case, it's sheer conjecture. Something onboard that plane obviously could burn even if all the jet fuel was gone. It could've been something as simple as the engine components still being hot enough to start brush fires when they hit the ground--the area of the crash did look brushy and dry. And fire really is secondary here anyhow, as the impact was obviously enough to completely destroy everything except the tail, which oddly enough, looked perfectly intact except for a couple of wrinkles.
Not being able to find the CVR, assuming they can't, is going to leave a big hole in the investigation. Even if the crew response to the original problem isn't on there, it could detail what the people in the cockpit were doing during the last 30 minutes of flight, and possibly who they were. If the CVR was just blown out of its box in the crash and destroyed, that's one thing. But if that plane was flying with the CVR actually removed, somebody's ass is grass. You know they'll be made an example of.
}:-)4
What sucks is that all these reports of passengers/flight attendants in the cockpit might be complete bovine effluents, in which case there will be nothing on the CVR but the background whine of all jet cockpits. I'd bet that the initial emergency is not on the tape.