The question: Should the bottom of the fitting (AN837-6D) be cut off bellow the nut to reduce the chance of fuel being pushed up the vent by fuel/air expansion?
The thinking: If left unmodified, with a full tank of gas the bottom of the unmodified fitting will be below the top of the fuel. Then thermal expansion of the fuel or trapped air could push the fuel up the vent line. Cutting the bottom of the fitting off below the nut would raise the fitting' entrance and minimize the potential fuel loss.
Thanks, Dave
The thinking: If left unmodified, with a full tank of gas the bottom of the unmodified fitting will be below the top of the fuel. Then thermal expansion of the fuel or trapped air could push the fuel up the vent line. Cutting the bottom of the fitting off below the nut would raise the fitting' entrance and minimize the potential fuel loss.
Thanks, Dave
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