Hummer H1 Service Manual page 163

3-26 Fuel, Emissions, and Exhaust
Main Fuel Tank Installation
NOTE: If tank was replaced, or if transmitter, pump, fitting, or
access plate was replaced, verify that components are properly
seated and secured. Refer to Fuel Level Transmitter and Tank
Access Plate Service procedure in this section.
1. Position tank on jack and raise tank just enough to permit
installation of wires and lines.
2. Connect fuel lines as follows:
a. Push lines onto tank supply and return tubes. Note
that fuel supply tube is larger in diameter than the
return tube.
b. Push line onto tank tube until it snaps or clicks into
place.
c. Pull on lines to verify secure attachment.
3. Connect wiring and vent lines. Also connect rollover valve
line.
4. Install filler neck-to-tank hose on fuel tank. Secure hose
with new clamp if required.
5. Position tank and install bolts and nuts that attach tank
upper to lower retaining straps. Tighten strap bolts to 23-
27 lb-in. (3 N•m) torque.
NOTE: If the upper and lower straps touch after bolt tighten-
ing, replace the straps. They are stretched or distorted and will
not adequately secure the tank.
6. Install propeller shaft.
7. Connect tank vent lines.
8. Lower vehicle
9. Install filler neck and connect ground strap.
10. Install filler neck housing and connect vent line.
11. Refill tank.
12. Start engine and verify proper operation. Repair any leaks
if necessary.
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AUXILIARY FUEL TANK
Removal
1. Drain auxiliary fuel tank. Drain tank with air powered por-
table drain equipment.
2. Remove tank filler neck housing from wheel house.
3. Remove bolts attaching auxiliary tank fuel filler neck and
housing to body.
4. Disconnect filler neck at tank and vent line at housing.
5. Support auxiliary tank with floor jack positioned under
tank skid plate.
NOTE: Do not loosen or remove the bolts attaching the tank to
the skid plate. The tank and skid plate will be removed as an
assembly.
6. Remove bolts and nuts attaching tank skid plate to left and
right frame brackets and rear crossmember.
7. Lower tank enough to reach fuel lines. Then disconnect
fuel lines, fuel level transmitter wires, and vent line. Mark
lines and wires for assembly reference.
NOTE: The fuel supply and return lines are equipped with
quick connect fittings. To disconnect, first lift and remove the
fitting retainer from each fitting. Then pull the fittings free of
the tank fuel tubes.
8. Lower the jack and remove the tank from under the
vehicle.
9. Replace fuel
(Figure 3-34). Refer to next procedure in this section.
Installation
1. If new tank is being installed, transfer tank skid plate to
new tank.
2. Place tank on floor jack and position it under vehicle.
3. Raise tank enough to reach feed lines.
4. Attach vent line and fuel level transmitter wires.
5. Connect fuel lines. Push each line onto tank tube. Secure
lines with retainers. Be sure retainers are firmly seated in
line fittings.
6. Raise and align tank skid plate with frame brackets and
rear crossmember.
7. Install tank attaching bolts and nuts and tighten securely.
8. Install filler tube housing and fuel filler cap.
9. Install filler tube shield in wheelhouse.
10. Refill fuel tank.
11. Verify tank operation and fuel level reading.
level transmitter and
®
access plate