•
FUEL
SYSTEM
14-21
FRAME
RAIL
SKID
PLATE
RN869
Fig.
1
Fuel
Tank
Skid
Plate
HEAT
SHIELDS
The sheet metal heat shields must be removed
when servicing fuel tank, fuel tubes/lines or vapor
vent line. It is very important that these heat shields be reinstalled after service. They are used
to protect lines and tank from heat of exhaust sys
tem. See Group 11 in this manual for proper instal lation.
FUEL
TANKS
DRAINING
FUEL
TANK
(1) Remove fuel tank filler tube cap to release fuel
tank pressure. (2) Perform Fuel System Pressure Release proce
dure as described in this group.
(3) Raise vehicle on hoist.
(4) Drain fuel into an approved portable holding
tank or a properly labeled gasoline safety container.
• If fuel pump operates, fuel can be drained through
fuel supply hose. The DRB II scan tool can be used to operate the electric fuel pump (gas engines only).
• If pump does not operate, but fuel level in fuel
tank is below fuel filler hose, fuel can be siphoned
through fuel filler hose. The hose will have to be dis connected from filler neck.
• If fuel tank is full and fuel pump does not operate,
drain fuel from filler neck. Support fuel tank with a
transmission jack. Loosen fuel tank mounting straps with passenger side fuel strap loosened slightly more
than driver side strap. Lower the tank slightly. Loosen the filler neck-to-filler hose clamp. Slide
clamp back on hose. Wrap shop towels around fuel
filler hose to absorb any spilled fuel. Disconnect filler
hose from filler neck. Drain fuel tank through filler
hose.
REMOVAL-MID-FRAME
MOUNTED
TANKS
(1) Drain fuel tank. Refer to Draining Fuel Tank
in this group. (2) Disconnect negative battery cable at battery.
(3) Remove fuel tank filler tube cap.
(4) Pump all fuel from fuel tank into an approved
portable holding tank. If this equipment is not avail
able,
disconnect fuel tube (line) and drain tank dry
into a properly identified Gasoline safety container.
Refer to Draining Fuel Tank.
(5) Raise vehicle on hoist. Disconnect all vent
hoses and filler hose (Figs. 2 and 3).
PRESSURE
RELIEF/
FUEL F,LTER
J9014-191
Fig.
2
Hose
Connections—Mid-Frame
Mounted
Fuel
Tanks—Typical (6) Place a transmission jack under the center of
the fuel tank. Apply a slight amount of pressure to fuel tank with transmission jack.
WARNING:
WRAP
SHOP
TOWELS
AROUND
HOSES
TO
CATCH
ANY
GASOLINE
SPILLAGE.
(7) Remove fuel tank mounting strap nuts at the
crossmembers (Fig. 4). Lower fuel tank enough to
permit fuel gauge wire and fuel tubes to be discon nected from fuel pump module at top of fuel tank.
Disconnect fuel tubes from fuel pump module (Fig.
5).
Refer to Quick-Connect Fittings in the Fuel De
livery sections of this group.
(8) Lower fuel tank.
INSTALLA
TION—MID-FRAME
MOUNTED
TANKS (1) Place fuel tank on top of transmission jack.
Raise tank until fuel supply tube, return tube and
pump/gauge sending unit connector can be connected to fuel pump module. Refer to Quick-Connect Fit
tings in the Fuel Delivery sections of this group.
(2) Raise tank into position under frame cross-
members and connect the two end mounting straps.
Remove transmission jack. Tighten all straps firmly.
Do not over tighten retaining strap nuts.
