TM 10-3930-659-20 5-13. FUEL PRESSURE DIFFERENTIAL SWITCH REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Materials/Parts: •    Battery disconnect switch in OFF position (see • Rags (Item 27, Appendix C) TM 10-3930-659-10). • Marker tags (Item 33, Appendix C) •    Left engine upper sideshield opened (see TM 10-• Two locknuts 3930-659-10). Tools/Test Equipment: References: •    General mechanic's tool kit (Item 44, Appendix F) • TM 10-3930-659-10 General Safety Instructions: •    DO NOT perform this procedure near fire, flames, or sparks. WARNING Diesel  fuel  Is  combustible.    DO  NOT  smoke  or  allow  open  flame  near  fuel pressure differential switch.  Failure to follow this warning will result in death or  serious  Injury  to  personnel.    If  you  are  burned,  Immediately  seek  medical aid. NOTE • A suitable container should be used to  catch  any  draining  fuel.    Ensure that all spills are properly cleaned. •     Connectors     should     be     tagged before  removal.    Refer  to  paragraph 2-18 for tagging Instructions. a. REMOVAL 1. Tag and disconnect two connectors (2) from fue pressure differential switch connectors (1). 2. Disconnect two fuel lines (3) from fuel pressure differential switch (4). 5-34