Thermo King SGCO 3000, Manual

Page: 97 / 144

Engine Maintenance
97
Fuel Return Line Replacement
The fuel return lines (hoses) and end cap on the
fuel injection nozzles should be changed every
10,000 engine operating hours. The return line kit
(P/N 10-373) contains new return lines, clamps,
an end cap, and a decal like the one shown below.
This decal is was added to production units in
January of 2005. The decal is located near the unit
serial plate. The date and engine hours must be
entered on the decal when the fuel return lines are
changed.
Figure 58: Fuel Return Line Replacement Decal
Use the following procedure to replace the fuel
return lines and end cap.
1. Remove the clamps, the end cap, the short fuel
return lines between the injection nozzles, and
the long fuel return line from the injection
nozzle to the banjo fitting on the injection
pump.
2. Discard the old clamps, end cap, and fuel
return lines.
3. Install the end cap and clamp. Note that the
end cap has a larger OD than the other hoses
and requires the larger clamp.
4. Install the fuel return lines and clamps. It may
be necessary to adjust the banjo fitting slightly
to obtain the straightest routing for the long
return line.
5. Be sure all the fittings are tight and check for
leaks.
6. Write the date and engine hours on the decal.
Bleeding the Fuel System
The fuel system must have the air bled out if any
of the following circumstances occur:
• If the fuel tank becomes empty
• If repairs are made to the fuel system
• If air gets into the system for any other reason.
NOTE: MAKE SURE the fuel tank vent is kept
open. If the vent becomes clogged, a partial
vacuum develops in the tank, and this increases
the tendency for air to enter the system.
To bleed air from the fuel system:
1. Loosen the bleed screw on the injection pump
about one turn.
1. End Cap 4. Short Fuel Return Lines
2. Larger Clamp 5. Long Fuel Return Lines
3. Smaller Clamps
Figure 59: Fuel Return Line Replacement
1
2
3
4
3
3
5
3
1. Bleed Screw 2. Priming Pump
Figure 60: Injection Pump
1
2