Chevrolet 10 1971 Series Chassis Service Manual page 332

FUEL TANK AN D EXHAUST SYSTEMS 8-8
The fuel lines should be inspected occasionally for
leaks, kinks or dents. If evidence of dirt is found in the
carburetor, fuel pump or on a disassembly, the lines
should be disconnected and blown out. Check the fuel
strainer in the tank for damage or omission.
When replacing a fuel line, only seamless steel tubing
is to be used. Also, the ends of the tubing must be
double-flared using commercially available double flaring
tools. All fuel lines must be properly routed and retained.
Service Inform ation ..................................................................................
Component Part Replacement
Canister and/or Canister Filter
The Components of this System are:
GASOLINE TANK FILLER NECK CAP
All models use a pressure-vacuum gasoline tank filler
neck cap.
No other type of gasoline tank filler neck cap is to be
used on vehicles incorporating this system.
GASOLINE TANK
The gasoline tanks incorporate special extended filler
necks and vents and also external hose connections.
LIQUID VAPOR SEPARATOR
The separator mounts to the right or left hand side of
COMPONENT PART REPLACEMENT (Fig. 11-15)
CANISTER A N D /O R CANISTER FILTER
Removal
1. Raise vehicle on hoist.
2. Note installed position of hoses on canister.
3. Disconnect hoses from top of canister.
4. Loosen clamps and remove canister.
5. If replacing filter, remove bottom of canister and
pull out filter.
Inspection
1. Check hose connection openings. Assure that they
are open.
2. On four barrel carburetor models, check operation
of purge valve by applying vacuum to the valve. A
good valve will hold vacuum.
Installation
1. Install new filter.
2. Assemble bottom of canister to canister body.
3. Install canister and tighten clamp bolts.
EVAPORATION CONTROL SYSTEM
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SERVICE INFORMATION
(Refer to Illustrations)
FRAME MOUNTED FUEL FILTER
Frame mounted fuel filters are standard equipment on
P20-30, series vehicles. The fuel filter element should
be replaced at the recommended mileage intervals out­
lined in Section 0, this manual.
INDEX
8-8 Canister Purge Valve ...............................................................................8-10
8-8 Separator ............................................................................... .................... 8-10
g.g Fuel Tank ................................................................................................... 8-10
the gasoline tank. If service is necessary, the entire
assembly must be replaced.
CANISTER
The canister is mounted on the left side of the engine
compartment. A filter is mounted in the bottom of the
canister. It is to be replaced according to the recom­
mended maintenance schedule.
HOSES
When replacing any evaporative emission hose, use
only replacement hose marked "EVAP". No other type
of hose is to be used.
SPRING
DIAPHRAGM
10—
Fig. Purge Valve
10-30 CHEVROLET TRUCK SERVICE MANUAL
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