TM 5-3805-260-24
to the cylinder, the force made by the pressure of the
fuel in the nozzle body will become less. The force of the
spring will then be more than the force of the pressure of
the fuel in the nozzle body. Valve (8) will move to the
closed position.
Valve (8) is a close fit with the inside of nozzle tip
(13), this makes a positive seal for the valve.
When the fuel is sent to the cylinder, a very small
quantity of fuel will leak by the valve guide. This fuel
gives lubrication to the moving parts of the fuel injection
nozzle.
FUNCTION OF FUEL JUNCTION
BLOCK
The location of the fuel junction block (4) is at the right
rear of the engine. The fuel lines from the fuel tank and
the engine connect at fuel junction block (4).
CONNECTIONS FOR FUEL LINES AT THE
FUEL JUNCTION BLOCK
1. Connection for constant bleed line to housing for
fuel injection pumps. 2. Connection for constant
bleed line to fuel tank. 3. Connection for fuel supply
line to fuel filter. 4. Fuel junction block. 5.
Connection for fuel supply line to fuel tank.
WATER SEPARATOR
The water separator is installed between the fuel
tank and the rest of the fuel system. For efficiency in the
action of the water separator the fuel flow must come
directly from the fuel tank and through the water
separator. This is because the action of going through a
pump or valves before the water separator lowers the
efficiency of the water separator.
The water separator can remove 95% of the
water in a fuel flow of up to 33 gph (125 liter/hr) if the
concentration of the water in the fuel is 10% or less. It is
important to check the water level in the water separator
frequently. The maximum amount of water which the
water separator can hold is 0.8 pt. (0.4 liter). At this
point the water fills the glass to 3/4 full. Do not let the
water separator have this much water before draining the
water. After the water level is at 3/4 full, the water
separator loses its efficiency and the water in the fuel
can go through the separator and cause damage to the
fuel injection pump.
Drain the water from the water separator every day or
when the water level gets to 1/’ full. This gives the
system protection from water in the fuel. If the fuel has a
high concentration of water, or if the flow rate of fuel
through the water separator is high, the water separator
fills with water faster and must be drained more often.
To drain the water separator, open drain valve (2) in the
drain line and vent valve (1) at the top of the water
separator. Let the water drain until it is all out of the
water separator. Close both valves.
WATER SEPARATOR
1 Vent Valve 2. Drain Valve
2-11
