Fuel System; Fuel Filters; Fuel Water Separator - Universal M3-20A Operator's Manual

FUEL SYSTEM
AWARNING:
Shut off the fuel valve at the tank when
servicing the fuel system. Take care in catching any fuel
that may spill. 00 NOT aI/ow any smoking, open flames
or other sources of fire near the fuel system when ser-
vicing. Ensure proper ventilation exists when servicing
the fuel system.
FUEL FILTERS
The fuel injection pump and the fuel injectors are precisely
manufactured and they must receive clean diesel fuel, free
from water and dirt. To ensure this flow of clean fuel, the fuel
must pass through at least two fuel filters, a fueVwater sepa-
rator and the
engine'5
spin-on fuel filter. Visually inspect,
clean, and change these filters according to the maintenance
schedule in this manual.
I. Shut fuel supply off.
2. Loosen the fuel filter, turning counterclockwise with a fil-
ler wrench.
3. Using a rag, wipe clean the sealing face on the housing
bracket so the new filter can be seated properly.
4. Lightly oil the sealing O-ring on the new filter. To re,in-
stall, turn the filter assembly clockwise carefully until the
O-ring contacts the sealing surface of the housing bracket.
Tum 2/3 further with the filter wrench.
5. Tum on the fuel and start the engine. The nonnal preheat
function should quickly prime the system and the engine
should start.
NOTE:
The cartridge contains fuel. Take care not
10
spill
it
during disassembl". Peiform the PRIMING TIlE FUEL
SYSTEM after replacing the spin-on
Jilt"
FUEL FILTER
TO INJECTORS
SPIN-ON FUEL FILTER
18
FUEL WATER SEPARATOR
A primary fuel filter of the water separating type must be
installed between the fuel tank and the engine to remove
water and other contaminants from the fuel before they can
be carried to the fuel system on the engine.
Most installers include a lype of filter/water separator with
the installation package as they are aware of the problems
that contaminants in the fuel can cause.
A typical fuel filter/water separator is illustrated in this dia-
gram. This is the Rayeor Model 500 MA. Keep in mind that
if a water separator type filter is not installed between the
fuel supply tank and engine-mounted fuel system, any water
in the fuel will affect the fuel pump, engine filter, and injec-
tion equipment. The owner/operator is responsible for making
certain the fuel reaching the engine"s injection equipment is
free of impurities. This process is accomplished
by
installing
and maintaining a proper filtration/separation system.
TO ENGINE
DRAIN
FROM
FUEL
TANK
FUEL FILTER
WATERISEPARATOR