AN 01-25CN-2             PARAGRAPH 6
   (e) TO ASSEMBLE THE PENDULUM IN THE OIL TANK-The pendulum may be reassembled and installed in the oil tank by reversing the procedure specified above.

   (f) TO INSTALL THE OIL TANK-Reverse the removal procedure.

  NOTE:  
It is advisable to use a non-hardening gasket cement when installing the elbow on the lower part of the tank. A 9 16 socket wrench with an extension can be used to advantage when installing this elbow.


   (g) TO FILL THE OIL SYSTEM-After the oil system has been completely drained, the following procedure is recommended. Fill the tank to the filter neck. Start the engine, run until the oil temperature is approximately 70' C. (158' F.), wait five minutes, and then check the oil level. If necessary, make additions to bring the level up to the neck.

   g. FUEL SYSTEM. (Drawing No. 87-420-1000.)

  (1) GENERAL-TANKS-There are two self. seating fuel cells and provision is made for the installation of a third self-sealing cell in the forward wing compartment. A belly tank may be installed as desired. Three sizes may be used, 52, 75, and 150 U. S. gallon capacity (43.5, 62.5, and 125 Imperial gallons). The fuselage tank holds 70 U. S. gallons (58.5 Imperial gallons) and is located immediately aft of the pilot and forward of the fuselage access door.

  The wing tank is located in the wing directly beneath the pilot and holds 54 U. S. gallons (45 Imperial gallons). The belly tank is fastened to the bomb shackle beneath the wing on the center line of the airplane. It may be released in flight by an L-21 bomb release handle actuated from the cockpit. All tanks are vented to the atmosphere. The wing and fuselage tanks vent lines drain at a "gang" drain in the trailing edge of the wing fillet on the left side of the airplane. A vent line connects the carburetor fuel chamber to the top of the fuselage tank. This vent line allows air to be expelled from the top of the carburetor fuel chamber when it is being filled and prevents vapor lock. The passage is closed by a check valve when the chamber is full. All fuel tanks contain an internal division system to trap fuel in a bank or side slip, assuring ample available fuel in such maneuvers. (See Fig. 90.) 		      (2) ACCESSORIES.
   (a) FUEL LINES-All fuel lines are gun-fire protected, self-sealing tubes. These self-seating fuel lines are made up of a seamless compound inner tube, layers of self-sealing material, plies of reinforcement, and a compound cover. The fuel lines will seal completely within two minutes after firing at a temperature of minus 4' to 38' C. (25' to 100' F.), and will seat within four minutes after firing at a temperature of minus 29' C. (minus 20' F.). Clamps for aromatic resistant self-sealing hose will be tightened by adjusting the clamp to finger tightness, then applying 2 to 2~'2 turns. After installation hose clamps will be inspected daily for proper tightness until the hose ceases to "cold flow" and the hose clamp remains tight.

  WARNING:  
Be sure that all layers of material in the self. sealing hose are firmly sealed together. After installation, be sure that the proper number of layers of material are showing beyond the clamp. Any discrepancy here will require immediate investigation, as a layer of material may have been pushed into the hose when it was installed on the tube connection, thus closing the fuel passage.


   Fuel is pumped from the tanks to the injection type Stromberg Bendix carburetor by a type G-9 engine-driven fuel pump. An electric fuel pump is incorporated in the suction line between the engine. driven fuel pump and the fuel cock. The electric pump consists of an integral explosion-proof electric motor and a small centrifugal type pump. This electric pump does not replace the engine-driven pump, but it is used in conjunction with it. The electric fuel pump switch should be "ON" for all engine operations. The electric fuel pump is controlled by a switch on the left hand side of the main switch panel and has two positions, "'ON" and "OFF".

  NOTE:  
When the Stromberg Bendix carburetor is first used after installation, or has been drained, this procedure should be followed: open the fuel cock and set the mixture control at "AUTOMATIC RICH" and the throttle half open. Switch on the electric fuel pump and allow the electric pump to operate until a small amount of fuel runs from the supercharger drain. A special condition exists when the carburetor is partly filled with air.