FTDK, expect to do a fuel cell every 6 to 8 years. Funnily enough the warranty on the cells is 5 years. I have replaced 4 during the time I have owned my Bo, two fairly recently. They are a pain in the arse to change and fail at the most inconvenient time and places. One of the small disadvantages of flying a Bonanza!
Look on the bright side... at least you didn't have to pay for it!
