Hello, I bought the Boeing 777-Freighter off of MSFS Marketplace.
I use simbrief to load my Fuel. But, when I plug in the fuel simbrief tell me to plug and I try to start up Apu, the Apu doesn’t  start. On the caution display it tells me that the  Fuel is low. Is there a decent fuel planner? because the fuel that simbrief gives me it’s not enough to start the engine.