4-23. FUEL SYSTEM AND AIR INTAKE - Continued
Tag and disconnect grounding wire (2)
from priming pump and fuel tank level
Tag and disconnect positive wire (3) from
Remove main engine fuel delivery line
Using a flat screwdriver, remove the 10
screws and washers clamping pump
upper flange to fuel tank.
Withdraw pump from fuel tank, allowing
fuel to drain out of pump into tank.
receptacle, remove hose clip (7) from
pump discharge. Pull hose (6) off nipple
and drain fuel from hose and pump.
Remove gasket (5) from pump flange and
underneath top plate.
Unclamp the clamp ring (9) holding pump
Connect 0 - 20 psi (0 - 150 kPa) gage to
Immerse pump (8) in an open container of
diesel fuel for at least 5 minutes.
Connect pump to a 12 volt battery via an
ammeter, voltmeter, fuse and switch as
Start pump and check the following
Pump pressure exceeds 7 psi (48
Battery voltage exceeds 13.2V
Pump current less than 5.0A
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.