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When the AC ground service bus is powered, the right aft AC fuel boost
pump may be used for APU operation instead of the DC start pump. Low fuel pressure (less than 5 psi) at engine inlet is indicated by a L/R INLET FUEL LOW PRESS light on the annunciator panel.
Fuel lines which pass through pressurized areas of the fuselage are shrouded to prevent possible leakage into the fuselage. The shrouds empty through pylon mounted drains on the lower aft fuselage.
Auxiliary Tank Fuel Transfer (not used at Continental)
The forward and aft auxiliary tanks transfer directly into the center tank, at an even rate (if Transfer Pump switches are in AUTO) when center tank reaches approximately 1,940 U.S. gallons (7,343 liters) or 13,200 pounds (5,987 kilograms).
The center tank fuel stop transfer float switches control operation of the transfer pumps to prevent overfilling the center tank. The FWD/AFT AUX FUEL PUMP PRESS LOW lights are armed when a transfer pump switch is in TEST or when in AUTO and the transfer float circuitry is in the fuel transfer mode.
Note: If power to the aux tank transfer control relay is interrupted (such as
by bus switching) during fuel transfer, the relay will relax, remove
power from the transfer pumps and end transfer. Automatic fuel
transfer will start again, however, when the center tank float switch
level is reached.
Fuel Tank Quantity Indicating
A standardized modular fuel gauging system is used which requires no adjustment or calibration after system installation or component replacement.
The Digital Fuel Quantity Display is located on the center instrument panel to indicate the quantity of the three tanks and gross weight. Operation of this display requires normal AC power.
An “A” or “B” channel may be selected for display.
A TEST button is installed to test the display before dispatch.
A Zero Fuel Weight feature allows the pilot to enter the dispatch ZFW which enables the gross weight display to add total fuel and provide an accurate Gross Weight for the flight.
For the refueler, an integral fuel load selector display panel located in the leading edge of the right wing, displays fuel quantity and load selection. A fuel control panel located adjacent to the fuel load selector display panel, controls the operation of the fill valves.
Fueling and Defueling
All fuel tanks can be fueled and defueled through a single-point fueling adapter and manifold located on the right wing. The method and quantity of refueling is determined by selective operation of the fuel control panel and fuel load selector display panel. The control panels, fuel fill valves and defueling valve are located in the right wing leading edge and are behind an access door. The fueling and defueling valves have pressure relief valves that vent into fuel tanks.
All fueling operations can be accomplished with airplane or externally supplied electrical power. If electrical power is not available for fueling operations, all fuel tank valves can be manually operated and fuel quantity measured using magnasticks. Fuel tanks may be defueled using tank boost pumps or by suction defueling. A ground service interphone jack is located near the fuel load selector panel.
Continental
Rev. 12/01/00 #29 Flight Manual
Each fuel tank has a fuel fill valve that may be controlled automatically or manually as determined by the selection of individual guarded switches. A fuel level float switch in the center tank and two level float switches in each main tank will automatically close the fill valves when the tank is full. Various quantities of fuel in tanks can be predetermined by selection of quantities on the fuel load selector display panel.
The left and right main fuel tanks can be gravity refueled through overwing fill adaptors. The center tank can be refueled via the main fuel tanks by transferring fuel from either of the main tanks using main tank fuel boost pumps to transfer fuel through the defueling manifold and center tank fill valve.
When AC power is available, fuel can be transferred from the center tank using center tank boost pumps and by opening the defueling valve and the fill valve of the selected tank.
Note: During fueling and defueling operations, ground service equipment
must be electrically grounded to the airplane through grounding
receptacles provided near the fueling receptacle in right wing
leading edge or on top of the wings near the overwing fill adapters.
MD-80 Sec. 13 Page 5
Flight Manual Continental Rev. 12/01/00 #29

START PUMP Switch
OFF - Removes 28 VDC from start          pump.
ON - Completes circuit fronm DC transfer bus to power start pump.                        NOTE
Used for starting APU or an engine when AC
　
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