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Fuel cap problem

Air pressure within each tank must be equal to achieve even fuel feed. A fuel cap that isn't sealing and leaks air will cause uneven fuel feed. A fuel cap on top of the wing is in a low pressure area. If the cap leaks air then the head pressure in the tank with the leaking fuel cap will be lower than the other tank.

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided is not intended to supercede or supplement the F.A.A. approved maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.