Boeing F4B-1 - Fuel System

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27. Installation ...
SECTION XI
FUEL SYSTEM
28. Auxiliary Tank Installation ... .
29. Maintenance .. . ... . .. . .... .... .. . ... .. ........... .. .
30. Repairs ... .. ... ...... ......... ... . .... .... .. .. .. ..... . .. ..... . .... . ... .. ... .
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27. INSTALLATION (Reference Fig. 14 to 20 inclusive): a. Figure 20 shows
the layout of the fuel system. Note that the releasable auxiliary tank is not an
essential part of the system and is only installed when extra fuel capacity is desired.
The installation of the main fuel tank and piping requires no explanation.
When installing the fuselage brace wires beneath the tank, check the alignment as
directed in paragraph llb, page 13.
b. The gas lines beneath the main tank should be protected against wear
from the brake cables.
c. When the auxiliary tank is not in use, the feed line leading to the shut-off
valve must be plugged in case of accidental opening of the valve.
28. AUXILIARY TANK INSTALLATION (Reference Fig. 19): The auxiliary
tank is installed as follows:
Open the center door in the bottom cowling between sta. 2 and 3, and fas ten
it forward to the nut plate provided. Remove the cover plate from the four inch
diameter opening to the left of the above door .
Slip the hooks on the nose of the tank over the hanger between the landing
gear axles. Pull out the release handle in the cockpit, raise the back end of the
tank into place and engage the support pins. Insert the locking wire through the
right hand support pin. Connect the feed line and see that the sump drain plug
is safetied.
29. MAINTENANCE: a. Inspect the entire fuel system at regular intervals .
Be sure that all fittings and connections are tight and that the gages register cor-
rectly. See that the relief valve, by-pass and pumps are in good order. Vents
must be kept open.
b. When the auxiliary tank is in use the release mechanism should be checked
occasionally to see that it operates readily. This may be done by having a man
hold up the rear end of the tank while the release mechanism is operated. Be
sure that the locking wire is replaced .
c. All strainers and screens should be cleaned regularly, preferably after
every five hours service.
d. The main tank may be drained by opening the cock beneath the tank.
The auxiliary tank may be drained by removing the sump plug. Do not forget
to replace the safety wires.
30. REPAIRS (Reference Fig. 16 and 17): a. The main tank is removed
through the bottom of the fuselage. Remove all pipe lines, fittings and controls
interfering, and the brace wires in the bottom of the fuselage. Support the tank
from beneath, loosen the strap turnbuckles on both sides, and remove the clevis
pins connecting the turnbuckles and the cradle. The tank may now be lowered
from the fuselage. It is necessary to tip the tank at an angle when part way out
to clear the landing gear axles and fairing.
b. The main tank is constructed of aluminum and repairs can only be made by
welding. The tank must be given not less than four hours flushing with steam
before welding.
c. When replacing the main tank see that all padding is in place and that all
nuts, pins and turnbuckles are securely locked. The alignment of the fuselage
must be checked when replacing the diagonal brace wires. (See paragraph llb,
page 13).
d. The auxiliary tank is constructed of brass and repairs can be made by
ordinary soldering methods.
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