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TM 5-4210-220-12
4-23. FUEL SYSTEM AND AIR INTAKE - Continued
(4)
Tag and disconnect grounding wire (2)
from priming pump and fuel tank level
sender.
(5)
Tag and disconnect positive wire (3) from
priming pump.
(6)
Remove main engine fuel delivery line
(4).
(7)
Using a flat screwdriver, remove the 10
screws and washers clamping pump
upper flange to fuel tank.
(8)
Withdraw pump from fuel tank, allowing
fuel to drain out of pump into tank.
(9)
While
holding
pump
over
suitable
receptacle, remove hose clip (7) from
pump discharge. Pull hose (6) off nipple
and drain fuel from hose and pump.
INSPECTION
(1)
Remove gasket (5) from pump flange and
discard.
(2)
Disconnect
electrical
lead
(10)
from
underneath top plate.
(3)
Unclamp the clamp ring (9) holding pump
to hanger.
(4)
Connect 0 - 20 psi (0 - 150 kPa) gage to
pump outlet.
(5)
Immerse pump (8) in an open container of
diesel fuel for at least 5 minutes.
(6)
Connect pump to a 12 volt battery via an
ammeter, voltmeter, fuse and switch as
shown.
(7)
Start pump and check the following
readings.
(a)
Pump pressure exceeds 7 psi (48
kPa)
(b)
Battery voltage exceeds 13.2V
(c)
Pump current less than 5.0A
(8)
If pump is not better than specification, leave it soaking for a further 10 minutes and try again. If pump
will not rotate at all check electrical connections, see REPAIR following. If it still will not meet
specification the pump is faulty and must be replaced.
4-395
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