TM 5-3805-280-24-2
Fuel System Operation and Tests
DIAGNOSE FUEL SUPPLY PUMP MALFUNCTIONS--ROTARY INJECTION PUMP
115
36
Symptom
Problem
Solution
Low Supply Pump Pressure or
Out of fuel.
Add fuel to tank.
Pump Not Functioning Correctly
Fuel shut off at tank.
Open shut-off valve.
Restricted fuel line.
Clean as required.
Air leak in fuel line between pump
Repair as required.
and tank.
Loose or damaged fuel line
Repair as required.
connections.
Hand primer lever left in upward
Move lever toward engine block as
position.
far as it will go.
Punctured or leaking diaphragm.
Replace pump. (See Group 35.)
Worn or damaged valve assemblies.
Replace pump. (See Group 35.)
Broken valve spring(s).
Replace pump. (See Group 35.)
Foreign material under diaphragm
Replace pump. (See Group 35.)
(from vent holes).
Wear or damage to hand primer
Replace pump. (See Group 35.)
linkage.
RG,115,JW7708
1924NOV971/1
13-563
