Greetings,
Mr. kr. I see no disadvantage to running with both fuel valves open. Doing so should allow tank equalization thus maintaining trim. Your thought of the STBD filling up if running on PORT is correct. I believe although Lehman's are reputed to return very little fuel to a tank IF you start with both tanks full you run the risk of an overflow on the STBD tank.
The only problem I can foresee is if you fill one tank with contaminated fuel, you may cross contaminate the other.
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RTF
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