Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 165

CESSNA
MODELT210M
SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
FUEL QUANTITY DATA (U.S. GALLONS)
TOTAL
TOTAL
USABLE FUEL
TOTAL
TANKS
UNUSABLE
FUEL
ALL FLIGHT
CONDITIONS
FUEL
VOLUME
STANDARD
89
1
90
(45 Gal. Each)
Figure 7-6. Fuel Quantity Data
system. However, when the fuel tanks are 1/ 4 full or less,
prolonged uncoordinated flight such as slips or skids can
uncover the fuel tank outlets, causing fuel starvation and
engine stoppage. Therefore, with low fuel reserves, do not
allow the airplane to remain in uncoordinated flight for
periods in excess of one minute.
Fuel flows by gravity from the two integral tanks to two reservoir
tanks, and from the reservoir tanks to a three-position selector valve
labeled LEFT ON,RIGHTON, and OFF. With the selector valve in the LEFT
ON or RIGHT ON position, fuel from either the left or right tank flows
through a bypass in the auxiliary fuel pump (when it is not in operation),
and through a strainer to an engine-driven fuel pump. The engiae-driven
fuel pump delivers the fuel to the fuel/ air control unit where it is metered
and directed to a manifold which distributes it to each cylinder.
NOTE
Fuel cannot be used from both fuel tanks simultaneously.
Vapor and excess fuel from the engine-driven fuel pump and fuel/air
control unit are returned by way of the selector valve to the reservoir tank
,.......,,,, of the wing fuel tank system being used.
The airplane may be serviced to a reduced capacity to permit heavier
cabin loadings. This is accomplished by filling each tank to the bottom
edge of the fuel filler neck, thus giving a reduced fuel load of 195 pounds in
each tank (192 pounds usable in all flight conditions).
Fuel system venting is essential to system operation. Complete
blockage of the venting system will result in decreasing fuel flow and
eventual engine stoppage. Venting is accomplished by vent lines, one from
each fuel tank, which are equipped with check valves. The fuel filler caps
are equipped with vacuum operated vents which open, allowing air into
the tanks, should the fuel tank vent lines become blocked.
7-29