Service Manual User Manual
Section 8A
8A-12
8A.7.1 Diesel Fuel
Fuel represents a major portion of vehicle operating
costs and therefore must be used efficiently. Always use
a premium brand of high-quality, clean diesel fuel. Low
cost, inferior fuel can lead to poor performance and
expensive engine repair.
Note: Use only diesel fuel designed for diesel engines.
Some heating fuels contain harmful chemicals that can
seriously affect engine efficiency and performance.
IMPORTANT: Due to the precise tolerances of diesel
injection systems, keep the fuel clean and free of dirt and
water. Dirt and water in the fuel system can cause severe
damage to both the injection pump and the injection noz-
zles.
Use ASTM No. 2 D fuel with a minimum cetane rating of
40. No. 2 diesel fuel gives the best economy and perfor-
mance under most operating conditions. Fuels with Cet-
ane numbers higher than 40 may be needed in high
altitudes or extremely low ambient temperatures to help
prevent misfiring and excessive smoking.
Inform the owner/operator of the vehicle to use No. 2 D
diesel fuel, unless ambient temperatures are below 32° F
(0° C). When temperatures are below 32° F (0° C), a
blend of No. 1 D and No. 2 D fuels, known as “winterized”
No. 2 D, may be used.
Note: No. 1 D fuel may be used, however, fuel economy
will be reduced.
Use a low-sulfur content fuel with a cloud point (the tem-
perature at which wax crystals form in diesel fuel) at least
10° below the lowest expected fuel temperature.
The viscosity of the fuel
must
be kept above 1.3 cen-
tistrokes to provide adequate fuel system lubrication.
Note: When using diesel fuel with a sulfur content below
1.3 percent, the filter change interval must be reduced by
75 hours. The use of fuel with a sulfur content above 1.3
percent is not recommended.
8A.7.2 Fuel Tank
The fuel tank (item 36, Fig. 8A–7) is located directly
beneath the operator’s cab.
A. Removal
The operator’s cab must be partially removed in order to
remove the fuel tank. Follow the directions for removing
the operator’s cab in
Section 4 Cab, Covers and Mirrors
,
then remove the fuel tank.
If a leaking fuel tank is suspected, check that all fuel tank
inlets and outlets are not the cause of the leak before
removing the cab and the fuel tank from the vehicle.
B. Disassembly
1. Remove the four #10-24 x 3/4" pan-head screws
(item 24, Fig. 8A–7), the #10-24 x 5/8" pan-head
screw (25), and the five #10 lockwashers (23)
securing the fuel sender cover (22) and fuel sender
with gasket (21) to the fuel tank.
2. Remove the black MI #6P square-head plug (20), the
#6-6P hose barb coupling (19), the #5-6P 90° hose
barb elbow (16) and both #10-6P 90° hose barb
elbows (17).
C. Cleaning and Drying
If contaminated fuel or foreign material is in the tank, the
tank can usually be cleaned. Replace a leaking or dam-
aged tank. DO NOT attempt to repair, plug or patch a
leaking or damaged fuel tank. The tank is manufactured
using an injection molding process and cannot be
repaired.
To clean the fuel tank:
1. Have a dry chemical (Class B) fire extinguisher near
the work area.
2. Invert and tilt the tank from side to side. Safely drain
any fuel into a suitable container. Dispose of properly.
3. Clean the fuel tank with a high-pressure washer, or
flush the tank with hot water for five minutes. Invert
the tank, tilt it from side to side, and drain the water.
4. If necessary, add a diesel fuel emulsifying agent to
the tank. Refer to the manufacturer’s instructions for
the correct emulsifying agent-to-water mixture ratio.
Refill the tank with water, and agitate the mixture for
10 minutes. Drain the tank completely.
WARNING: DO NOT mix gasoline or alcohol
with diesel fuel. The mixture can cause an
explosion.
WARNING: NEVER drain or store fuel in an
open container due to the possibility of explo-
sion or fire. Discard the fuel in an approved
manner.
Model 3606 • Origin 10/99