Low-Pressure Fuel Pump - Doosan DX22 Operation & Maintenance Manual

Low-Pressure Fuel Pump

Refer to the following figure for information on the layout of
low-pressure fuel lines, the fuel flow direction, and the pressure
range of each fuel line in normal operating conditions.
High-pressure
fuel pump
Low-pressure
fuel pump
Secondary fuel filter
Components
The low-pressure fuel pump is integrated with the
high-pressure fuel pump. The low-pressure fuel pump on
bank no. 1 consists of two sets of adapters and sealing
washers for connecting fuel lines to the fuel inlet/outlet ports,
while the low-pressure pump on bank no. 2 consists of one
set of an adapter and sealing washer for connecting the fuel
line to the fuel inlet port.
High-pressure
fuel pump
Low-pressure
fuel pump
Unfiltered fuel under negative pressure: 0.5 – 1.0 bar (absolute pressure)
Unfiltered fuel under positive pressure: Max. 8.5 bar (relative pressure)
Filtered fuel under positive pressure: Max. 8.5 bar (relative pressure)
Returned fuel under positive pressure: Max. 1.2 bar (absolute pressure)
117
8. Fuel System
Junction block
EDX22190220