TM 5-3805-280-24-2
Fuel System
TEST IN-LINE FUEL SUPPLY PUMP FOR
35
22
LEAKS
Fuel delivery pressure should be checked before
removing supply pump from injection pump. (See CHECK
FUEL SUPPLY PUMP OPERATION, in Group 115.)
1. Connect compressed air line (A) to a pressure gauge
(B) and to supply pump inlet fitting. Air line should
have a regulating valve to control pressure.
2. Cap or plug supply pump outlet fitting (C).
3. Submerge supply pump in a container of clean diesel
fuel. Regulate air pressure to 200 kPa (2.0 bar) (29
psi).
4. Move roller tappet in and out by hand. No air bubbles
should appear around roller tappet.
NOTE: If bubbles appear, it is an indication that either the
A--Air Line
O-ring seal is defective or spindle or tappet is
B--Pressure Gauge
worn (or possibly both).
C--Outlet Fitting
IMPORTANT: Serious injection pump or engine
damage could occur, if enough diesel
fuel leaks past spindle and seal. Fuel
leakage past spindle dilutes engine oil.
RG,35,JW7617
1920NOV971/1
13-401
