Inspect
the fuel tank caps to determine they are the correct type and size for the
installation, and that "O" rings are in good condition.
a. Unvented caps, substituted for
vented caps, will cause fuel starvation and possible collapse of the fuel tank
or cell. Malfunctioning of this type occurs when the pressure within the tank
decreases as the fuel is withdrawn. Eventually, a point is reached where the
fuel will no longer flow, and/or the outside atmospheric pressure collapses the
tank. Thus, the effects will occur
sooner with a full fuel tank than with one partially filled.
b. Check
tank vents and overflow lines thoroughly for condition, obstructions, correct
installation, and proper operation of any check valves and ice protection
units. Pay particular attention to the location of the tank vents when such
information is provided in the manufacturer's service instructions. Inspect
for cracked or deteriorated filler opening recess drains, which may allow
spilled fuel to accumulate within the wing or fuselage. One method of
inspection is to plug the fuel line at the outlet and observe fuel placed in
the filler opening recess. If drainage takes place, investigate condition of
the line and purge any excess fuel from the wing.
c. Assure
that filler opening markings are affixed to, or near, the filler opening;
marked according to the applicable airworthiness requirements; and are
complete and legible.
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