Fuel Lift Pump Pressure Low.
Remove fuel lines from output side of fuel lift pump (WP 0116).
Attach pressure gauge to output side of fuel lift pump.
Lock steering frame (TM 5-3895-379-10).
Turn battery disconnect switch to ON position (TM 5-3895-379-10).
Have an assistant crank engine for 10 seconds.
· Normal pressure is 6-10 psi (40-70 kPa).
· Minimum pressure is 4.5 psi (30 kPa).
Observe pressure gauge.
Note highest indication on pressure gauge.
Turn engine start switch to OFF position (TM 5-3895-379-10).
Time should be greater than 30 seconds.
Observe amount of time for maximum pressure noted during cranking to drop by one half.
If fuel lift pump outlet pressure is below 4.5 (30 kPa), replace fuel lift pump (WP 0116).
If time for maximum pressure noted during cranking to drop by one half is less than 30
If fuel lift pump pressure is OK, install fuel line (WP 0116) and go to next malfunction.
Figure 2. Fuel Lift Pump.