Pontiac Fiero 1988 Service Manual page 547

6E2-C3-2 DRIVEABILITY A N D E M I S S I O N S - F U E L INJECTION (TBI)
DIAGNOSIS
VISUAL CHECK OF CANISTER
• Cracked or damaged, replace canister.
• Fuel leaking from bottom of canister, replace
canister and check hoses and hose routing.
• Check filter at bottom of canister. If dirty,
plugged, or damaged, replace filter.
FUNCTIONAL T E S T S
Canister Purge Valve
Apply a short length of hose to the lower tube of
purge valve, and attempt to blow through it. Little or
no air should pass into the canister. (A small amount
of air will pass if the canister has a constant purge
hole).
With hand vacuum pump, apply vacuum (15"Hg.
or 51 kPa) through the control valve tube (upper tube).
The diaphragm should hold vacuum for at least 20
seconds. If it does not hold vacuum the canister must
be replaced. If the diaphragm holds vacuum, again try
to blow through the hose connected to the lower tube
while vacuum is still being applied. An increased flow
of air should be observed. If not, the canister must be
replaced.
O N - C A R SERWICE
FUEL VAPOR CANISTER
Remove or Disconnect
1. Hoses from canister. Mark hoses to install on new
canister.
2. Canister.
Install or Connect
1. Canister.
2. Hoses. Make sure connections are correct.
PARTS INFORMATION
PART NAME GROUP
Canister, Fuel Vapor 3.130
*******
m
E
f
I T ,
LZZZZA
0
jjjj
FUEL TANK
5
CANISTER
0
VAPOR RESTRICTION
PURGE C O N T R O L V A L V E
VAPOR STORAGE TANK
jjfj
PRESSURE/VACUUM VENTED FUEL FILLER CAP
3-19-87
8 P 0 3 4 3 - S Y E
Figure C3-2 - Evaporative Emissions Control System Schematic 2.5L VIN R " P " Series