Note: Do not allow fuel quantity in center tank to go above 20,500 lbs.
- - - WHEN AUX FUEL PUMP PRESS LOW LIGHT COMES ON - - -
AUX TRANS Pump Switches ........................................................ OFF

* * * *
MD-80 Sec. 3 Page 59
Flight Manual Continental Rev. 12/01/00 #29

CENTER FUEL TANK DOES NOT FEED

FUEL X-FEED Lever .................................................................... OFF
Center Tank Boost Pump Switches .....................................BOTH ON
Main Tank Boost Pump Switches...........................................ALL ON

Fuel Feeds From Center Tank:

Continue normal operation.
* * * *
Fuel Still Does Not Feed From Center Tank:
Boost Pump Switches In One Main Tank...................BOTH OFF

Inlet Fuel Pressure Low Light Is On:
Assume center (and aux, if installed) tank fuel is unavailable.
Plan remainder of flight using main tanks only.
OR
Main Tank Boost Pump Switches ............................. ALL ON
Center Tank Boost Pump Switches......................BOTH OFF

* * * *
IF Inlet Fuel Pressure Low Light Is Off:
Boost Pump Switches in Other Main Tank .........BOTH OFF

Verify that center tank fuel quantity is decreasing.
- - - - - WHEN CENTER TANK INDICATES 500 LBS - - - - -
Main Tank Boost Pump Switches ..................................................................... ALL ON
Note:  If required, remaining center tank fuel may be used by operating center tank pump to supply one engine. Remaining engine should be operated using its associated main tank pumps. Monitor fuel quality and maintain fuel distribution within maximum lateral limits.
* * * *

Sec. 3 Page 60 MD-80
Rev. 05/15/95 #23 Continental Flight Manual

CROSSFEED OPERATION TO
CORRECT MAIN TANK IMBALANCE

FUEL Boost Pumps (Main Tank With Greater Quantity)....................ON
FUEL X-FEED Lever.............................................................................ON
FUEL Boost Pumps (Opposite Main Tank) .............................BOTH OFF
Center Tank FUEL Boost Pumps.............................................BOTH OFF
Caution: Monitor fuel quantity in order to remain within lateral fuel

balance limits and to avoid fuel depletion which could result in a two engine flame-out. Note: If unable to correct imbalance condition by crossfeed operation, refer to FUEL LEAK, this section.
- - - - - WHEN MAIN TANKS ARE BALANCED - - - - -
Left & Right Main Tank FUEL Boost Pumps.................................................................... BOTH ON IN EACH MAIN TANK
Center Tank FUEL Boost Pumps......................................AS REQUIRED

FUEL X-FEED Lever ........................................................................... OFF

* * * *
MD-80 Sec. 3 Page 61
Flight Manual Continental Rev. 08/01/98  #27

FUEL FILTER PRESS DROP LIGHT ON

Note: Fuel heat switches should be off for takeoff, final approach, and go-around. IF On Ground: Maintenance action required.

OR
* * * *

IF In Flight:
IF Fuel Temperature at/above 15°C:

Light may be due to fuel filter clogging by solid contaminants other than ice. Continued engine operation is permissible if engine oil temperature is maintained within normal limits.
Caution: If both L and R FUEL FILTER PRESS DROP lights are
OR
illuminated, consider possibility of fuel contamination and land at nearest suitable airport.
* * * *

IF Fuel Temperature below 15°C:
Fuel Heat Switches ................. BOTH MOMENTARILY ON

Observe both FUEL HEAT lights come on and remain on for approximately 1 minute.
- - - - - AFTER ONE MINUTE - - - - -

IF FUEL FILTER PRESS DROP Light Remains Out:
Continue normal operation.
OR
* * * *

IF FUEL FILTER PRESS DROP Light Remains On:
Repeat procedure. Fuel heat applications may be repeated if required. Do not exceed engine oil temperature limitations.
* * * *
Sec. 3 Page 62 MD-80
Rev. 05/15/95 #23 Continental Flight Manual

FUEL FLOW INOPERATIVE OR READS HIGH

Fuel Flow Inoperative:
Fuel Flow C/B’s (K&L 27)...........................RESET IF TRIPPED

* * * *
Fuel Flow Reads High:
Throttle (Affected Engine).................................................... IDLE

Note:  Idle fuel flow varies from about 800 PPH at 20,000 feet to 600 PPH at 35,000 feet.
IF  Fuel Flow Responds And Other Indications Are Normal, But Idle Fuel Flow Is Higher Than Normal:
Fuel Quality and Fuel Consumed ..................... CHECK

Verify that no fuel leak exists. 
　
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