TM 5-3805-280-24-2
Fuel System Operation and Tests
MEASURE FUEL SUPPLY PUMP
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PRESSURE--ROTARY INJECTION PUMP
1. Remove plug on fuel filter base.
2. Install test equipment as shown.
3. Start engine. Fuel pump should maintain minimum
positive pressure listed below. If pressure is low,
replace filter element and recheck pressure.
Fuel Static Pressure--Specification
Pressure ....................................................... 25--30 kPa (0.25--0.30 bar)
(3.5--4.5 psi)
Minimum Static Pressure at 850 rpm Engine Speed--Specification
Pressure .......................................................... 15 kPa (0.15 bar) (2.0 psi)
Minimum Positive Pressure at 2400 rpm Engine Speed--
Specification
Pressure ....................................................... 21--34 kPa (0.21--0.34 bar)
(3--5 psi)
Minimum Flow at 2400 rpm Engine Speed--Specification
Flow .......................................................................... 1.5 L/min (0.42 gpm)
If pressure is still low, perform the following:
1. Disconnect pump-to-filter fuel line at the filter.
2. With throttle set at no-fuel position (or injection pump
shut-off solenoid wire disconnected) so engine will not
start, turn engine over several times with starting
motor.
3. If fuel spurts from the line, the pump is operating
properly.
NOTE: Look for a possible restriction in filter/filter base.
Make sure pressure gauge/hose assembly is not
at fault.
RG,115,JW7707 1924NOV971/1
13-564
