TM 10-3930-659-20 5-15. FUEL LINES AND FITTINGS REPLACEMENT.(Con’t). c. FUEL FILTER HOUSING-TO-FUEL PRESSURE DIFFERENTIAL SWITCH FUEL LINE AND FITTINGS REPLACEMENT 1. Remove fuel line (14) from adapters (13 and 15). 2. Remove    adapter    (13)    from    fuel    pressure differential switch (12). 3. Remove adapter (15) from tee (16). 4. Install adapter (15) on tee (16). 5. Install  adapter  (13)  on  fuel  pressure  differential switch (12). 6. Install fuel line (14) on adapters (13 and 15). d. FUEL FILTER HOUSING-TO-FUEL PRIMER PUMP FUEL LINE AND FITTINGS REPLACEMENT 1 Remove  fuel  line  (19)  from  elbow  (18)  and  tee (20). 2. Remove elbow (18) from fuel primer pump (17). 3. Install elbow (18) on fuel primer pump (17). 4. Install fuel line (19) on elbow (18) and tee (20). TA706875 5-43