Solvents can burn easily, can give off harmful vapors, and are harmful to skin and clothing. To avoid
injury or death, keep away from open fire and use in a well-ventilated area. If solvent gets on skin or
clothing, wash immediately with soap and water.
Unscrew the magnetic drain plug from the bottom of the fuel tank, clean it of all particles, inspect for
thread damage, and replace on fuel tank prior to cleaning fuel tank.
When a fuel tank is repaired for leaks, it is necessary to clean, inspect, and test it. Coordinate the following two steps with
the inspection and testing procedures which follow this cleaning section. Clean other fuel tank components with cleaning
compound or paint thinner and dry with compressed air.
Slush fuel tank interior with methylene chloride or cleaning compound as specified in TB 750-1047 to remove residual
fuel, dirt, sediment, and foreign matter.
Drain and air dry. Reclean magnetic drain plug if necessary.
Inspection-Acceptance and Rejection Criteria
Inspect fuel tank for cleanliness. Repeat above cleaning procedures if necessary.
Inspect fuel tank for any obvious cracks or open seams. Inspect mounting brackets, mounts, and cushions for cracks or
breaks. Weld fuel tank and components as required (refer to TM 9-237).
Inspect fuel tank inlets and outlets for thread damage. Repair with a thread chaser as required.
Close all openings with temporary plugs or other closures and apply 34 psi (2128 kPa) internal air pressure.
Apply soapy water solution consisting of liquid detergent diluted with 2040% water to all exterior surfaces and inspect for
air bubble formation.
Mark location of any bubble formation, rinse and dry fuel tank, and weld the marked areas (refer to TM 9-237).
Repeat steps 13.