Thermo King T-1080S, Maintenance Manual

Page: 104 / 191

Engine Maintenance
103
Bleeding the Fuel System
The fuel system will have to have the air bled out
if the engine runs out of fuel, if repairs are made
to the fuel system, or air gets into the system for
any other reason.
NOTE: MAKE SURE to keep the fuel tank vent
open. If the vent becomes clogged, a partial
vacuum develops in the tank, and this increases
the tendency for air to enter the system.
Proceed as follows:
1. Loosen the bleeder screw on the return fuel
fitting of the injection pump.
2. Turn on the electric fuel pump. The electric
fuel pump is energized when the
O
N
key is
pushed. Tighten the bleeder screw on the
injection pump when clear flow of fuel
appears.
NOTE: At initial start-up, open the bleeder
screw at the injection pump and bleed fuel
until a clear flow is noted.
3. Loosen the injector lines on the injection
nozzles.
4. Crank the engine until fuel appears at the
nozzles. Tighten the injector lines, and start
the engine.
NOTE: Fuel will not appear at the nozzles by
merely running the electric pump. The
engine must be cranked.
Draining Water from Fuel Tank
Water run through the system may damage the
injection pump or nozzles. Damage to the fuel
system will subsequently cause more expensive
damage to the engine. A large accumulation of
water in the bottom of the fuel tank will stop a
diesel engine. Water should be drained off during
scheduled maintenance inspections to prevent
breakdowns. Drain the water off after the fuel
tank and unit have remained idle for an hour.
1. Place a container under the fuel tank to catch
the draining water and fuel.
2. Remove the drain plug from the bottom of the
fuel tank.
NOTE: Some fuel tanks have a check valve
in the drain plug fitting. Push the check
valve open with a small screw driver to drain
the tank.
3. Let the water and fuel drain into the container
until no water is visible in the fuel draining
from the tank. If the water and fuel do not
drain freely, the vent may be plugged. If so,
clean or replace the vent.
4. Install the drain plug.
Fuel Filter Replacement
Replace the fuel filter at intervals according to the
Maintenance Inspection Schedule.
1. Remove the filter and discard.
2. Lubricate rubber ring of new filter with fuel.
3. Install the filter and tighten until the filter is
slightly loose (rubber ring not making
contact).
4. Bleed the air from the filter by operating the
electric pump until fuel bubbles appear at the
top of filter.
5. Tighten the filter until the rubber ring makes
contact, then tighten 1/2 turn more.
1. Injector Line 2. Bleeder Screw
Figure 183: Injection Pump
2
1