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TM 55-2915-335-30&P
Table 2-1. Fault Isolation
NOTE
If checking fuel pump with cartridge installed,
do not remove cartridge; proceed to Block 4.
l
Check pump cartridge for jammed motor or
stripped impeller.
l
Manually rotate impeller counterclock-
wise.
Does impeller and armature turn?
If jammed, proceed to Malfunction Number 2,
Step 1 of Table 2-2.
Running motor over one minute without a flow
of liquid may cause permanent damage to the
motor.
NOTE
Motor circuit may be checked with cartridge in
or out of housing.
l
Check motor circuit.
l
Lay pump on its side on workbench.
l
Connect pump to 28 ±0.2 VDC power
supply. Black lead is positive.
l
Turn pump power ON. Bring voltage up
to 28 VDC.
Does motor run?
If impeller spins on armature shaft, proceed to
Malfunction Number 3, Step 3 of Table 2-2.
Check current draw at ammeter:
If current draw is 0 amps, proceed to Mal-
function Number 1 of Table 2-2.
If current draw is over 6 amps, proceed to Mal-
function Number 2 of Table 2-2.
If current draw is between 0 and 6 amps,
proceed to Malfunction Number 5 of Table 2-2.
Does motor run smoothly?
Proceed to Malfunction Number 7 of Table 2-2.
To block 8
2-3
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