TM 10-3930-671-24 b. Fuel Water Separator Service. 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) of vehicle. (1) To remove fuel water separator bowl (1), proceed as follows: (a) Disconnect batteries (Para 3-25). NOTE Prior to removal, position wiping rag under fuel water separator to catch any spilled fuel. (b) Loosen nut (2) and remove fuel water separator bowl (1), gasket (3), and filter (4) from housing (5).  Discard gasket and filter. (c) Wipe all foreign material from fuel water separator bowl (1). (2) To install fuel water separator bowl (1), proceed as follows: (a) Position fuel water separator bowl (1), with gasket (3) and filter (4), in housing (5). (b) Tighten nut (2) until fuel water separator bowl (1) is securely seated in housing (5). (c) Connect batteries (Para 3-25). END OF TASK 3-22