TM 55-1510-220-10 (2.) Bleed air valve switches - ENVIRO OFF. (3.) Vent blower switch - AUTO. (4.) Aft vent blower switch - OFF. (5.) Cabin temperature mode selector switch - OFF. (6.) If smoke and fumes are not eliminated:   Cabin pressure dump switch - CABIN PRESS DUMP. NOTE Opening storm window (after depressurizing)   will   facilitate   smoke   and fume removal. 7. Engine oil pressure Monitor. 9-21.  FUEL SYSTEM. a. Fuel Pressure Warning Annunciator Light Illuminated.    Illumination  of  the  #1  FUEL  PRESS  or  #2 FUEL PRESS warning light usually indicates failure of the respective    engine-driven    boost    pump.        Perform    the following: (1.) Standby pump switch ON. (2.) Fuel     pressure     warning     annunciator     light Check extinguished. (3.) If fuel pressure warning light is still illuminated: Record unboosted time. b. No    Fuel    Transfer    Caution    Light    Illuminated. Illumination of a #1 NO FUEL XFR or #2 NO FUEL XFR annunciator   light   with   fuel   remaining   in   the   respective auxiliary fuel tank indicates a failure of that automatic fuel transfer system.  Proceed as follows: (1.) AUX TRANSFER switch (affected side)  - OVERRIDE. (2.) Auxiliary fuel quantity - Monitor. (3.) AUX TRANSFER switch (after respective auxiliary fuel has completely transferred) - AUTO. c. Nacelle   Fuel   Leak.      If   nacelle   fuel   leaks   are evident, perform the following: 1. Perform engine shutdown. 2. Fire pull handle - Pull. 3. Land as soon as practicable. d. Fuel Crossfeed.  Fuel crossfeed is normally used only  during  single-engine  operation.    The  fuel  from  the dead  engine  side  may  be  used  to  supply  the  live  engine by routing the fuel through the crossfeed system.  During extended flights, this method of fuel usage will provide a more  balanced  lateral  load  condition  in  the  aircraft.    For fuel crossfeed, use the following procedure: (1.) AUX TRANSFER switches - AUTO. NOTE With the FIRE PULL handle pulled, the fuel in the auxiliary tank for that side will not be available (usable) for crossfeed. (2.) Standby pumps - OFF. (3.) Crossfeed switch - As required. (4.) Fuel crossfeed advisory annunciator light - Check illuminated. NOTE With   the   FIRE   PULL   handle   pulled,   the respective   #1   FUEL   PRESS   or   #2   FUEL PRESS light will remain illuminated on the side supplying fuel. (5.) Fuel  pressure light extinguished Check. (6.) Fuel quantity - Monitor. Change 3     9-11