If the Fuel Pumps had been turned "ON" and left in the "ON" position....perhaps there would have been no crash.
In the BO=105 and BK-117....which have the same kind of fuel system....that is how we did it and never had a problem.
The Supply Tanks hold a very small amount of fuel and if you turn the pumps off.....you have to either land or turn the pumps back on in a most timely fashion.
In earlier posts....a Pump Switch dance was described by Pilots currently flying the 135.....and it did make me wonder why that would be considering the down side to forgetting to turn them back on at some point.