Textron JACOBSEN GP400, Technical/Repair Manual

Page: 36 / 354

3-6 4252490-Rev A
ENGINE
3
Checks and Adjustments—
Diesel Models
Purging the Fuel System (Diesel)
See Figures 3-4 and 3-5.
!
CAUTION
NOTE
The fuel system will need to be purged of air whenever
the fuel filter or fuel lines are removed, the fuel tank is
completely emptied, or the engine has not been used for
an extended time.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Raise the hydraulic oil/fuel tank. (See “Raise
Hydraulic Oil/Fuel Tank” on page 9-4.)
NOTE
Be sure the fuel tank is filled with clean, fresh diesel fuel
before performing a purge of the fuel system.
Figure 3-4
3. Turn fuel shutoff lever (2) to the vertical (on) position.
4. Loosen air vent screw (3) at the top of the filter by
turning it counterclockwise two turns. Place a
suitable container under the filter to catch fuel that
will flow from the screw hole.
5. When bubbles no longer appear in fuel coming out of
the air vent screw hole, tighten the air vent screw.
6. Open air vent plug (1) at the top of the fuel injection
pump.
Figure 3-5
!
WARNING
7. Place throttle control lever (4) in the slowest position,
and crank engine over for approximately 10 seconds.
8. Close air vent plug when bubbles no longer appear in
the fuel flow and turn the ignition switch to the off
position.
9. When the fuel system has been purged and the
engine is running, listen to the engine. If the engine is
misfiring, repeat steps 6 through 8.
Do not purge fuel system when engine is hot.
TN3897
2
1
3
The engine may start during this process. Be
careful of injury due to moving components. If
the engine starts, continue purging the fuel
system.
TN3692
4