TM 10-3930-671-24 (2) 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) of vehicle. NOTE Install all wires, fittings, and hoses as tagged and marked prior to removal. (a) To install fuel gauge sending unit (20), proceed as follows: 1 Install strainer (28) on fuel gauge sending unit (20) with clamp (27). 2 Install seal (25) and fuel gauge sending unit (20) in fuel tank (26) with retainer (24). 3 Install two fuel lines (23) on fuel gauge sending unit (20). 4 Install wires (21) and (22) on fuel gauge sending unit (20). 3-60