Volvo D16F Service Bulletin page 3

Volvo Trucks North America
Service Bulletin
Supply Pump Valves
Two valves are located in the supply pump (1).
The safety valve (11) allows fuel to flow back to the
suction side if the pressure becomes too high, e.g., if the
fuel filter is blocked or is too restricted. The non-return
valve (12) opens when hand-priming is used.
Automatic Bleeding
If air gets into the system, it is bled when the engine
starts. During bleeding, the air is pressed out of the fuel
filter housing (4) down to the fuel tank on the return line
(23). Bleeding for the filter replacement is controlled by
a valve (15).
Water Drainage
Draining water from the water separator (6) through the
drain valve (16) requires the following:
•
The sensor (14) in the water separator indicates water
in the fuel bowl.
•
The engine is not running.
•
The parking brake is applied.
Manual Hand Pump
The manual hand pump (13) is located on the fuel filter
housing and is used to pump fuel (when the engine is not
running) after the fuel system has been drained for repair,
etc. The non-return valve (22) for the hand-priming pump
is also located in the fuel filter housing.
Other
The fuel filter housing eliminates the need to drain the fuel
when replacing the filter. The valve pegs (17) and (21)
close when the fuel filter is removed. It is not necessary
to bleed the fuel system after replacing the filter, since
this is performed automatically when the engine is started
and runs for more than 2 minutes.
The pressure sensor (19) on the fuel filter housing
monitors the supply pressure after the fuel filter. A fault
code is displayed on the instrument cluster if the fuel
supply pressure is less than the specified value.
A fuel heater (20) is available as an option. It is located
in the lower part of the water separator. The fuel tank
breather (18) prevents excessive vacuum in the fuel
tank(s) which could possibly result in fuel starvation.
D
Date Group No.
230 247
11.2006
Page
3(11)