Click here to make tpub.com your Home Page

Page Title: The low pressure fuel system
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

19
TM 9-2320-312-24-2
Systems Operation Section
(8) Fuel supply line
(11) Fuel filter
(35) Fuel transfer pump
(9) Fuel pressure regulator
(12) Fuel tank
Fuel pressure regulator (9) consists of an orifice
The low pressure fuel system serves three functions.
and a spring loaded check valve. The orifice is a
The low pressure fuel system supplies fuel for
flow restriction that pressurizes the supply fuel.
combustion to injectors (7). Also, the low pressure
The spring loaded check valve opens at 35 kPa
fuel system supplies excess fuel flow in order to
(5 psi) in order to allow the fuel which has flowed
cool the unit injectors and the low pressure fuel
through the orifice to return to fuel tank (12). When
system supplies excess fuel flow in order to remove
the engine is off and no fuel pressure is present,
air from the system.
the spring loaded check valve closes. The spring
loaded check valve closes in order to prevent the
The low pressure fuel system consists of four basic
fuel in the cylinder head from draining back to the
components:
fuel tank.
Fuel pressure regulator (9)
Fuel filter (11)
Fuel tank (12)
Fuel transfer pump (35)
Fuel transfer pump (35) is mounted on the back of
unit injector hydraulic pump (1). The fuel transfer
pump pushes pressurized fuel out of the outlet port
and the fuel transfer pump draws new fuel into the
inlet port.
Fuel is drawn from fuel tank (12) and flows through
two micron fuel filter (11).
Fuel flows from fuel filter (11) to the inlet side of
fuel transfer pump (35). An inlet check valve in the
inlet port of the fuel transfer pump opens in order
to allow the flow of fuel into the pump. After the
fuel flow has stopped, the inlet check valve closes
in order to prevent fuel flow out of the inlet port.
Fuel flows from the inlet port in the pump to the
outlet port, which also has a check valve. The outlet
check valve opens in order to allow pressurized fuel
flow out of the pump. The outlet check valve closes
in order to prevent pressurized fuel leakage back
through the pump.
Fuel flows from the outlet port of fuel transfer pump
(35) to the fuel supply passage in the cylinder head.
The fuel supply passage is a drilled hole which
begins at the front of the cylinder head. The fuel
supply passage extends to the back of the cylinder
head. This passage connects with each unit injector
bore in order to supply fuel to unit injectors (7). Fuel
from the transfer pump flows through the cylinder
head to all of the unit injectors. Excess fuel flows out
of the back of the cylinder head. After the excess
flows out of the back of the cylinder head, the fuel
flows into fuel pressure regulator (9).

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business