Uneven fuel feed
1. Vent problem.
To prevent uneven fuel feed both tanks must be equally vented.
This requires that the air pressure in each tank be equal. Uneven fuel
tank pressure can occur because of the position of the fuel vent to the
direction of flight. Fuel vent position is important on aircraft where
the vent is mounted on the underside of the wing next to the wing strut.
For Cessna aircraft, position the vent according to the Cessna service
manual.
Also check for clogged vent lines. With the gas caps off, gently
blow into the vent.
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