Sorry to hear of the problems with your flight gorter, however as an engineer and having worked on the B757 for 20 years, you are incorrect with your assumption.
The only way you can get rid of fuel on the B757 is burn it, or loose it and this only by having a leak.
If you noticed a kerosene smell, it would have been brought in by the air-conditioning system, which might have resulted from an engine failure.