TM 1-1500-204-23-3 (b) Wrap the cell in wrapping paper, UU-P-268, MIL-P-17667, grade A barrier material.  MIL-B-121, or polyethylene sheeting, L-P-378, and pack the wrapped cell in a fiberboard box and close box by any suitable means. NOTE When boxes cannot be obtained, the fuel cells may be stored for a short period of time on a specially   constructed   rack   which   will   adequately   support   the   cells.      Cells   may   also   be temporarily  stored  with  only  the  interior  dunnage  in  place;  however,  these  cells  cannot  be stacked. (c) Mark  the  fuel  cell  in  accordance  with  MIL-STD-129.    If  the  fuel  cell  is  temporarily  stored  and  not boxed, the same information will be placed on a tag and the tag securely fastened to the cell. (d) Store cells in a cool, dry area, free from drafts, dust, and ozone, and out of direct sunlight or direct contact with the ground. (e) Stack crated cells on widest side of crate, never on end, and not to the extent that crushing of lowest crate will result. (f) Arrange cells in storage to ensure use of oldest units first. (8) Depreservation.  The following procedures should be used to depreserve fuel cells: CAUTION To prevent damage to fuel cells, remove all sharp objects from pockets and wear covers over shoes. (a) Remove all access panels needed to inspect the inside of the fuel cell. WARNING To prevent asphyxiation from fuel, oil and alcohol fumes, you must wear protective clothing, i.e.,  an  apron,  a  respirator,  a  face  shield  and  rubber  gloves.    Use  an  air  compressor  to continuously pump air into the tank when personnel are in the tank.  Ground the air hose to the tank.  Assign a person to monitor the person in the tank in the event he is overcome by fumes. (b) Inspect the inside of the fuel cell for fungus contamination. (c) If fungus is present, clean the contaminated cell as follows: 1 Mix 70 percent ethyl alcohol, denatured, grade Ill, O-E-760, NSN 6810-00-201-0907, with 30 percent water for a cleaning agent. 2 Wipe the complete interior of the cell.  Use a clean lint free cloth, CCC-C-46A, NSN 7920-00-292-9204. (d) Spray  the  inside  of  the  fuel  cell  with  approximately  10  gallons  of  fuel.    For  type  fuel  refer  to  the applicable aircraft manual. (e) Drain the flushing fuel and install the cell.  Check for leaks using the instructions in the applicable aircraft manual. g. Testing  Fuel  Systems  and  Tanks/Cells  for  Leaks.    Leak  test  methods,  classification  of  leaks,  and  approved testing fluids are explained below.  Leak source, path, and exit should always be considered.  Figures 2-9 through 2-13 show various leak paths. (1) Methods.  The following paragraphs describe detecting and locating leaks. (a) Introduction.    Dyed  fuel  may  be  used  for  static  leak  detection  of  JP-4  fuel  cells  and  complete  fuel systems.  In-flight tests to detect leaks, which cannot be detected by static or engine runup test may be used.  However, the use of in-flight tests requires special approval of the maintenance officer. (b) Preparation  of  dye  solution.   The  quantities  of  liquid  dye  to  be  used  and  the  mixing  ratios  are  as specified in table 2-7. 2-23