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The vent scoop and pressure relief valve are on an access door
in each surge tank.
Functional Description
Vent channels and vent tubes equalize the pressure between
each tank and the surge tanks when the airplane is in a climb
attitude. The surge tanks are open to the atmosphere through
the vent scoop.
The fuel vent float valves equalize the pressure between main
tank 1, main tank 2, and the surge tanks when the airplane is in
a cruise or descent attitude.
The drain float valves in the vent tubes and the vent channels
permit fuel in the vent system to drain into the tank when the
fuel level is lower than the valve.
The surge tank drain check valve permits fuel in the surge tank
to flow to either main tank 1 or main tank 2. The surge tank drain
check valve also prevents fuel flow from main tank 1 and main
tank 2 to the surge tank.
FUEL STORAGE - FUEL VENT SYSTEM
EFFECTIVITY
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The pressure relief valve prevents damage to the wing
structure when there is too much positive or negative
pressure in the fuel tanks. The pressure relief valve is usually
closed. When closed, it is even with the bottom surface of the
wing. When there is too much positive or negative pressure, the
pressure relief valve opens. When it is open, part of the
pressure relief valve is in the fuel tank. After it opens, the
pressure relief valve stays in the open position. In the open
position, the pressure relief valve supplies an additional vent in
the surge tank. Pull the reset handle to move the pressure relief
valve to the closed position.
For normal operations, make sure the pressure relief valve is
closed. An open pressure relief valve is a symptom of a
problem in the fuel vent system.
FUEL STORAGE - FUEL VENT SYSTEM
EFFECTIVITY
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FUEL STORAGE - FUEL VENT SYSTEM
FUEL STORAGE - FUEL VENT SYSTEM
EFFECTIVITY
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General
The center tank fuel scavenge system increases the quantity of
fuel you can use.
Functional Description
The left forward boost pump supplies motive flow to a jet pump.
The jet pump removes fuel from the center tank and transfers it
to main tank 1. The jet pump has no parts that move. It is on the
left front spar. A fuel scavenge shutoff valve controls fuel sent to
main tank 1. When the fuel level in main tank 1 decreases to
4,487 lbs (1,990 kgs) the float valve opens.
The minimum fuel transfer rate for the fuel scavenge system is
220 lbs/hour (100 kgs/hour). The fuel transfer rate for the fuel
scavenge system is generally between 220 lbs/hour (100 kgs/
hour) and 450 lbs/hour (200 kgs/hour).
FUEL STORAGE - CENTER TANK SCAVENGE SYSTEM
EFFECTIVITY
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FUEL STORAGE - CENTER TANK SCAVENGE SYSTEM
FUEL STORAGE - CENTER TANK SCAVENGE SYSTEM
EFFECTIVITY
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28-10-00-005
THIS PAGE IS INTENTIONALLY LEFT BLANK
28-21-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The pressure fueling system lets you refuel all tanks. You also
use the system during fuel transfer from tank to tank.
PRESSURE FUELING SYSTEM - INTRODUCTION
EFFECTIVITY
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PRESSURE FUELING SYSTEM - INTRODUCTION
PRESSURE FUELING SYSTEM - INTRODUCTION
EFFECTIVITY
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