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Old 19-03-2019, 04:18 PM   #883
Raven
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This from the blurb from Newton Equipment on Tank Vent Valves. Mandatory in ACU race regs these days.

A Tank Vent Valve should allow air to enter the tank to replace the volume of fuel volume exiting the tank without allowing fuel to be lost through the vent system. In our design, should any fuel enter the valve, the hollow plastic ball will float on the fuel and seal the valve.
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