TM 5-3805-280-24-2
Fuel System Operation and Tests
115
Symptom
Problem
Solution
42
Defective O-ring seal.
Replace O-ring seal.
RG,115,JW7704
1924NOV972/2
TEST FUEL SUPPLY PUMP FOR LEAKS--
IN-LINE INJECTION PUMP
Fuel delivery pressure should be checked before
removing supply pump from injection pump. (See FUEL
SUPPLY PUMP OPERATION--IN-LINE INJECTION
PUMP, earlier in this group).
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.
A--Air Line
NOTE: If bubbles appear, it is an indication that either the
B--Pressure Gauge
O-ring seal is defective or tappet is worn (or
C--Outlet Fitting
possibly both).
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,115,JW7703
1924NOV971/1
13-569
