TROUBLESHOOTING PROCEDURES - CONTINUED
Table 1. Engine Troubleshooting Procedures - Continued.
TEST OR INSPECTION
Engine Misfires or Idles Rough - 3. Check fuel lift pump pressure. 1. If fuel lift pump outlet pressure is
Remove fuel line from output
below 4.5 psi (30 kPa), replace
output port of fuel lift pump. Turn 2. If time for maximum pressure
noted during cranking to drop by
on battery disconnect switch and
one half is less than 30 seconds,
lock steering frame (TM 5-3895-
379-10). Have assistant crank
engine for 10 seconds. Observe
pressure gauge. Note highest 3. If lift pump pressure checks are
indication on pressure gauge.
Normal pressure is 6 to 10 psi (40
to 70 kPa). Minimum pressure is
4.5 psi (30 kPa). Turn engine start
switch OFF (TM 5-3895-379-
10). Observe amount of time for
maximum pressure noted during
cranking to drop by one half.
Time should be greater than 30
seconds. Remove pressure gauge
from fuel lift pump.