Fuel System.21 - Onan 200 DFP Operator's Manual

FUEL SYSTEM
The engine has been primarily designed to operate on
No. 2 diesel fuels since such fuels have a higher energy
content and are generally lower in cost. The engine will
also operate satisfactorily on No. 1 fuel or other similar
fuels if they meet certain specifications. Consult the
engine manufacturer for the specific requirements if
using a non-standard fuel.
Fuel Handling Precautions
Take appropriate precautions to prevent the entrance of
dirt, water, or other contaminants into the fuel system.
Filter or strain the fuel as the tank is filled.
AWAPNINP I
l9n't'on of fue* can cause serious
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personai injury or death by fire or
explosion. Do not permit any flame, cigarette, or other
igniter near the fuel system.
To avoid condensation problems, keep fuel supply
tanks as full as possible by filling up each time the
engine is used. In cold weather, warm fuel returning
from the injectors heats the fuel in the supply tank. If the
fuel level is low, the upper portion of the tank tends to
form condensation. In warm weather, both the fuel and
the tank will be warm during the daytime. At night, cool
air tends to lower the temperature of the tank more
rapidly than the temperature of the fuel. If the fuel level is
low, the upper portion of the tank will cool more rapidly
and tend to form condensation.
Condensation (water) can cause clogging of fuel filters
as well as freezing problems. In addition, water mixing
with the sulphur in the fuel forms acid which can cor¬
rode and damage engine parts.
Fuel Filter
The filter (see Figure 11) is a spin-off throw-away unit. A
water drain is situated at the bottom of the filter case.
This should be used to drain off moisture either daily or
at the end of every exercise period, depending on unit
application. Fill the new filters with diesel fuel and put a
light coat of fuel on the sealing gasket. Install and tighten
by hand until the gasket just touches the filter head.
Tighten an additional one-half to three-fourths of a turn.
Periodically remove the drain plug to drain off moisture
and sediment at the interval specificed in the Mainte¬
nance Table.
DFP DFM
FIGURE 11. FUEL FILTERS
21