4.  
Lubricate the seal and O-ring, and install in the cap assembly.

5.  
Ascertain that the shaft is in place and install cover. Secure with screws.

6.  
Slide the spacer and gear on the shaft, with the pinholes aligned so that the gear teeth are opposite the selector lever. Secure the gear with roll pin.

7.  
Install the O-ring packing on the cap assembly.

8.  
Place the selector handle in neutral in relation to the cap and install the cap assembly in the valve body. Secure the cap assembly with screws and washers.

9.  
Check valve operation.

LEAK TEST OF SELECTOR VALVE.
1.  
Connect the inlet port of the valve assembly to a 25 psi air source.

2.  
Plug the right hand port and close the left hand port by placing the control lever to the right.

3.  
Apply pressure to 25 psi. There shall be no evidence of leakage either through the port or around the fitting and lever when submerged in kerosene or a similar petroleum base fluid for 30 seconds.

4.  
Depressurize, remove the plug from the right hand port, place on left hand port and close right hand port by placing the lever to left.

5.  
Repeat Step 3.

6.  
Disconnect and wipe fluid from exterior.

CLEANING FUEL SYSTEM.
1.  
To flush fuel cell and selector valve, disconnect the fuel line from the carburetor.

2.  
Select a fuel cell, turn on the electric pump and flush fuel through the system until the tank is empty. Agitation of the fuel within the cell during this operation will help pick up and remove dirt and other foreign matter from the fuel cell and selector valve.

3.  
Repeat this procedure for each fuel cell.

4.  
When both cells are flushed, clean fuel filter and fuel tank finger screens.

28-20-00 Page 28-22 Issued: April 1, 1997
ELECTRIC FUEL PUMP.
REMOVAL AND INSTALLATION OF ELECTRIC FUEL PUMP.
There is one electric fuel pump for each engine. The pump is mounted in the inboard side of wing. To remove pump. proceed as follows:
1.  
Remove access cover located on the bottom of the inboard wing.

2.  
Remove the fuel lines from the pump, and disconnect the electrical wiring.

3.  
Remove bolts holding pump in position and withdraw pump through access opening.

4.  
Do not attempt to disassemble or repair fuel pump. If fuel pump proves to be defective it should be replaced.

5.  
Reinstall pump in reverse order of removal.

— CAUTION —
DO NOT RUN PUMP DRY.

INDICATING.
FUEL QUANTITY SENDER UNIT.
— Note —
The fuel cells in each nacelle are interconnected and have a total capacity of 110 gallons. Fuel quantity sender units mounted in each fuel cell transmit electrically the quantity of fuel in each cell, to fuel quantity gauges mounted in the instrument panel. A dipstick in the side pocket of the cabin, can also be used to manually check the indicating system.
FUEL QUANTITY SENDER/GAUGE CHECK (INSTALLED).
Fuel quantity sender units and fuel quantity gauges can be checked while mounted in the airplane by using the following procedure:
1.  
Put the fuel selector levers in the “ON” position. Completely drain fuel cell that relates to the fuel quantity sender and gauge to be checked. (Refer to Draining Fuel System, Chapter 12)

2.  
Level airplane laterally. (Refer to Leveling, Chapter 8)

— Note —
An external power supply providing 14 ± .2 volts should be utilized for the fuel Quantity Sender/Gauge Check.
28-40-00 Page 28-23 Issued: April 1, 1997
3.  
With the master switch in the “OFF” position, 14 ± .2 volts D.C. applied to system, fuel selector valves in the “ON” position, and no fuel in the tanks, the gauge needle should be centered on the white dot to the left of the “O” radial mark, with a maximum deviation of 1/2 needle width. If not within this tolerance the guage should be replaced.

4.  
Add fuel to the tanks in accordance with the information given in Chart 2802, until tanks are full. Observe the gauge reading at each 10 gallon increment. To reduce internal gauge friction tap the gauge.

5.  
With the tanks full the needle should be centered on the “F” radial mark within ± 1 needle width.  If not within this tolerance adjust (refer to Figure 28-6), just sufficiently to bring it within tolerance - do not center the needle.

CHART 2802. SENDER/FUEL QUANTITY GAUGE TOLERANCES
FUEL QUANTITY  SENDER 
ADDED  RESISTANCE  GAUGE  TOLERANCE 
　
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