Fuel Tank Vent Line Service - Hummer H1 Service Manual

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FUEL TANK
VENT LINE
BRACKETS
Figure 3-37: Fuel Tank Vent Line Locations
(Typical)

Fuel Tank Vent Line Service

Removal
1. Remove fuel tank. Refer to procedure in this section.
2. Remove clip and fuel tank vent line hose from vent line
(Figure 3-37).
3. Remove vent line clamps and disenagage lines.
4. Remove tie strap securing vent line to fuel lines. Discard
tie strap.
5. Disconnect fuel tank vent lines at tank fittings.
Installation
1. Connect vent lines to tank fitting.
2. Secure vent line to fuel lines with new tie strap (Figure 3-37).
3. Secure vent lines in brackets with clamps and bolts.
4. Install fuel tank.
FUEL TANK VENT FILTER REPLACEMENT
The fuel tank vent filter is located just above the surge tank at
the passenger side of the engine compartment (Figure 3-37).
The filter is serviced as an assembly and should be replaced if
restricted or damaged.
To replace the filter, remove the filter retaining clamp bolt, pull
the filter out of the clamp, and disconnect it from the vent line.
Be sure the replacement filter is properly secured in the clamp
afterward. Also, use a new vent line clamp if the original is
worn, or distorted.
5745159
Fuel, Emissions, and Exhaust
FUEL LINES VENT LINE FILTER
VENT LINE
MAIN OR AUXILIARY TANK FUEL LINE
REPLACEMENT (ALL)
Removal
1. Drain tank with portable, air powered equipment.
2. Remove main or auxiliary fuel tank as described in this section.
3. Disconnect any electrical wires, linkage parts, cables, or
lines as needed if insufficient slack exists.
4. Disconnect fuel lines at main tank tubes.
5. Remove line clamps and tie straps.
6. Disconnect lines at fuel tank selector valve and remove
lines.
7. Disconnect supply line at fuel pump.
8. On all models, if front lines are to be replaced, disconnect
lines at fuel pump and return fittings.
9. Remove
(Figure 3-39).
Installation
1. Route new lines as needed (Figure 3-39). Be sure lines are
not kinked, pinched, or touching hot or rotating parts.
2. Connect front fuel lines to fuel pump and return fitting at
injection pump. Then connect lines to fuel selector valve.
3. Secure lines to frame clamps, brackets, P-clips, and tie
straps as needed.
4. Connect rear lines to auxiliary or main tank as required.
5. Install main or auxiliary fuel tank as described in this
section.
6. Verify that fuel lines are securely connected and properly
routed.
7. Refill fuel tank.
8. Check tank operation. Verify proper transmitter operation
and selector switch function.
Figure 3-38: Fuel Tank Vent Filter Location
supply and/or
3-29
ELBOW
FUEL TANK
VENT LINE
BODY
BRACKET
return lines as needed