1 2-17. FUEL TANK - Continued
(b) Large hole leaks (1/4 2 in. (6-50 mm).
sandpaper or file. Smooth edges of hole using
a round file. Install a patch of aluminum at
least 1/2 in (12 mm) bigger than the hole. Lap
weld the patch to the outside of the tank.
Cracks in flat area: Roughen up area around
crack using sandpaper or file. Install a patch
of Aluminum which is at least 1 in. (25 mm)
wide and at least 1/2 In. (12 mm) longer than
the crack. Butt weld the patch to the outside of
(d) Cracks in weld: Grind out filler material in the
area of the crack. Extend crack at least 1/2 In
(12 mm) into adjoining weld. Smooth edges of
the weld area with a file and remake the joint.
(7) When the weld is complete seal all openings in the tank.
(8) Connect a regulated air supply with gage to one opening.