I made the same basic mistake in a BO105 once - left the transfer pump switches off
It happens in FW as well, so you're not alone, all of us have had the "I won't be doing that again" moments. Trouble is, one doesn't live long enough to learn all the lessons.
https://www.atsb.gov.au/media/1358105/ao2007036.pdf
Following the 214 event above, the pilot was shown the door, court case had him reinstated. Pity is, the management of the time are still of the opinion "it was all his fault". No lessons learnt there, you can lead a horse to water...………..