TM 5-5420-226-20-1 DETAILED TROUBLESHOOTING PROCEDURE VEHICLE OPERATION -  POWERPLANT, STARTING Symptom-5 ONE   ELECTRICAL FUEL    PUMP   WILL NOT   WORK. I ~ NOTE This   procedure is  to  be  performed by two persons. The lead person is referred to as the first technician and    shall direct the activity of   the second person called the second technician. I E 4 Check for   fuel    pump    not   running. 1 First Technician (Rear Grille Doors) l   Listen   for   sound   of   left   fuel   tank   fuel   pump    running when switches are    turned ON. Second Technician (Operator’s Station) l   Set    MASTER BATTERY switch ON. l   Set   FUEL PUMPS switch ON. l   Listen   for   sound   of   right   fuel   tank   fuel   pump   running l   Determine which fuel   pump is   not    running; then set MASTER BATTERY switch OFF. Which fuel    pump    was    not   running? -J FOR   CLARITY QUADRANT ASSEMBLIES NOT   SHOWN Da FUEL    PUMPS M/iSTER SWITCH BATTERY SWITCH l   Check    front   accessory harness (CKT    76)   at   bulkhead disconnect for   electrical power to   left   fuel    tank    fuel pump. TA106857 4-168