TM 9-2320-209-20-3-1 4-8. FUEL PUMP (IN-TANK) REMOVAL AND REPLACEMENT. TOOLS : Flat-tip screwdriver 7/16-inch wrench 3/4-inch wrench 3/8-inch wrench Tape measure SUPPLIES : Solvent, dry cleaning, type II (SD-2), Fed. Spec P-D-680 Sealer compound, type II, MIL-S-45180 PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. WARNING a. several b. Preliminary Do not permit smoking, sparks or open flame within 50 feet of truck during fuel pump removal. Fuel could explode, causing injury to personnel and damage to equipment. Procedures. (1) On trucks M756A2, M275A1, and M275A2, fuel tank must be moved out inches to replace in-tank fuel pump. Refer to para 4-6 and para 4-7. (2) Disconnect battery ground cable. Refer to para 7-58. Removal. FRAME 1 1. Take electrical connector (1) off fuel pump receptacle ( 2). 2. Using 3/8-inch wrench, unscrew heater line coupling nut (3) from elbow ( 4). NOTE Some trucks may not have heater fuel line. If not, pipe plug replaces elbow. 3. Using 3/4-inch wrench, unscrew feed line coupling nut (5) from fuel pump tee fitting (6) . GO TO FRAME 2 4-46