Departing the hover removed this issue but you had to remember to switch the boosters on again during cruise!
That's why I never used to switch them off when in the hover, because I knew that the captions would go out as I flew away.
Chopjock, you obviously don't understand the fuel system requirements for twin engine helicopters.
Yes, the 135 has three tanks. One Main tank and one Supply tank for each engine, one of which holds more fuel than the other so that both engines don't run dry at the same time.
two priming pumps, two transfer pumps
Correct. the priming, or Boost, pumps supply the engines during the start as the engine driven pumps aren't powerful enough by themselves. Perhaps they should be, but they aren't, hence the Boost pumps, which get turned off after start, when the Transfer pumps are turned on.
They then stay on and are not required to be turned off until all the fuel in the Main tank is used.
Complicated? No. Simple? Yes.