TM 10-3930-669-20 4-6.  FUEL FILLER TUBE REPLACEMENT (CONT). b. Installation. WARNING Fuel is very flammable and can explode easily.  To avoid serious injury or death, keep fuel away from open fire and keep fire extinguisher within easy reach when working with fuel.  Do not work on fuel system when engine is hot.  Fuel can be ignited by hot engine.  When working with fuel, post signs that read NO SMOKING WITHIN 50 FEET (15 m). (1) Position seal (10) on fuel filler tube (9). (2) Position fuel filler tube (9) in fuel tank (8). (3) Install  two  retainers  (7)  on  fuel  tank  (8) with four screws (6). (4) Install    plate    (5)    with    two    screws    (2), washers (4), and lock washers (3). WARNING Adhesives,    solvents,    and    sealing compounds 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 adhesive, solvent, or sealing compound  gets  on  skin  or  clothing, wash    immediately    with    soap    and water. (5) Apply adhesive to seal (1). (6) Install seal (1) on plate (3). NOTE Follow-on Maintenance: • Close cab door (TM 10-3930-669-10). • Remove wheel chocks (TM 3930-669- 10). END OF TASK 4-18