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6C-2
1977 PONTIAC SERVICE MANUAL
Fig. 6C-1 Mechanical Fuel Pump
Filler necks are soldered into the tank on all series cars.
All filler necks have restrictors to prevent the entry of leaded
fuel nozzles.
In all series except A-Series station wagons, the tank is
vented during filling by an internal baffle inside the filler.
FUEL SYSTEM
In A-Series station wagons, the tank is vented during
filling by the filler neck.
In all series the tank outlet consists of a combination fuel
pickup, filter and fuel gage tank unit. The tank unit can be
removed by removing a cam ring which retains the unit.
The fuel line is coated, welded steel tubing. Connections
from the tank unit to the line and from the line to the fuel
pump are made with synthetic rubber hose attached with
spring clamps.
FUEL CAP
The fuel cap is a screw on type for all series (except H
Series) and incorporates a ratchet action which prevents over
tightening.
The "H" series fuel cap is equipped with a double set
of locking tangs plus a pressure-vacuum safety relief valve.
EVAPORATIVE EMISSION CONTROL
SYSTEM (EEC)
The Evaporative Emission Control System is a closed
system that prevents gasoline vapors in the fuel tank and
carburetor from entering the atmosphere.
DIAGNOSIS
diagnosis section can be found in the Engine Performance
Diagnosis located at the front of Section 6 .
All diagnosis related to the fuel system not found in this
EVAPORATIVE EMISSION SYSTEM
Condition
Fuel Odor
Possible Cause
Correction
1. Vapor leak from Evap.
1. Inspect and correct as
system.
necessary fuel and evaporation
hoses and pipes, fuel sender
sealing gasket and fuel cap.
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