Wow, a fuel thing. Seems to be the cause of many 337 accidents. My rules: 1. Always top off the mains 2. Never fly more than 3 hours on the mains 3. Never switch the aux tanks at the same time, wait at least 5-10 minutes 4. Always feel for the indent 5. Grease the fuel valves during each annual 6. Burn main tanks for at least 2 hours before switching to the aux tanks (book says 1 hour, but why do just the minimum?)
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