Pontiac Fiero 1988 Service Manual page 685

6E3-C3-2 DRIVEABILITY A N D EMISSIONS - F U E L INJECTION (PORT)
Jj^J THROTTLE BODY
JjQ FUEL TANK
J^f| CANISTER
B
L H
L H
VAPOR RESTRICTION
PURGE C O N T R O L V A L V E
PRESSURE/VACUUM VENTED FUEL 1 iLLER CAP
3-19-87
8 P 0 3 4 0 - S Y E
Figure C3-2 - Evaporative Emissions Control System S c h e m a t i c 2.8L VIN 9
FUNCTIONAL T E S T S
ON-CAR SERVICE
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.
F U E L V A P O R CANISTER
4-+
R e m o v e 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
P A R T N A M E
Canister, Fuel Vapor
G R O U P
3.130
f