Replacing Solenoid; Engine Air Cleaner; Figure 5.2 Fuel Filter And Fuel Circuit - Carrier Supra 950MT Operation & Service Manual

Return Tube
a. Checking Fuel Circuit
1. The engine must run with the bleed port slightly unscrewed. This indicates that injection pump pressure is
greater than 0.1 bars. If not, check for air leakages and clean fuel lines.
2. The electrical pump is designed to deliver 0.7 bar. The fuel circuit flow rate in the return line is about five
liters per hour.
b. Changing Fuel Filter
After changing fuel filter, operate the electrical pump to properly bleed the fuel circuit before engine start.
When changing fuel filter, the new filter should be filled with clean fuel.
5.2.3

Replacing Solenoid

a. Dual Hold & Pull Coil Solenoid
During start sequence, hold coil is energized. When starter is engaged, pull coil is energized. After engine start
(max 10s) - stater disengaged - pull coil is de-energized. Hold coil is kept energized
See Section 5.10.2 for solenoid coil replacement procedure.
5.2.4

Engine Air Cleaner

a. Inspection
The air cleaner, hose, and connections should be inspected for leaks or fractures in the inlet and outlet hoses. A
damaged air cleaner or hose can seriously affect the performance and life of the engine. If housing has been
dented or damaged, check all connections immediately.

Figure 5.2 Fuel Filter and Fuel Circuit

Fuel Filter
Fuel Pump
CAUTION
!
Restrictor Fitting
Injection Pump
Supply line
Return line
5-5
Bleed Port
Injectors
62-11863