Purging The Fuel System - Jacobsen R-311T Technical/Repair Manual

ENGINE

Purging the Fuel System

Adjustment
See Figure 3-7.
Do not purge fuel system when engine is hot.
NOTE
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, purge the system of air.
1. Park the mower safely. (See "Park Mower Safely" on
page 1-6.)
3
2. Raise the hood.
NOTE
Be sure the fuel tank is filled with clean, fresh diesel fuel
before performing a purge of the fuel system.
1
3. Loosen the 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 the fuel
that will flow from the screw hole.
4. Turn the ignition switch to the on position to allow the
fuel pump to operate.
5. When the bubbles disappear from fuel coming out of
the air vent screw hole, tighten air vent screw and
turn ignition switch to the off position.
6. Open the air vent plug (2) on the fuel injection pump.
3-6
!
CAUTION
3
Figure 3-7
7. Turn the ignition switch to the ON position to allow
the fuel pump to operate.
8. Close the air vent plug when bubbles disappear from
the fuel flow and turn the ignition switch to the off
position.
The engine may start during this process. Be
careful of injury due to moving components. If
the engine starts, continue purging the remaining
fuel injector lines.
9. Loosen the high pressure fuel injector line nuts at the
four fuel injectors (1), one at a time while, cranking
the engine.
10. When the bubbles disappear, tighten the fuel injector
line nut and repeat the process for the remaining
injectors.
11. When all the fuel injector lines have been purged and
the engine is running, listen to the engine. If the
engine is misfiring, repeat steps 9 and 10 for all the
fuel injector lines.
2
TN9951
!
WARNING
4234520 First Edition