Chevrolet CAMARO 1979 Service Manual page 563

FUEL SYSÎÊM
6C.11
DIAGNOSIS
EVAPORATIVE
CONTROT SYSTEM
C O N D I T I O N
POSSIBLE CAUSE
COR RECTION
Elidencê of fuel lo$ or fuel
A) From area o1 fuel tânk or fuel
cap - Perform pressure check
to determine possible causes
Leaking or plugged fuel
Leâking flel fi ler neck
Fuel filler neck gasket surface
nicked. bured, or dented
Leâkin9 sendinq unit or gasket
Leâkinq tank switch unit
InôPerative tank switch unit
P ugqed or inoperative tank
pressure control vâlve
1 ,
2.
3.
5.
6 .
7 .
8.
8. Repair or replace âs nece$ary
1, Repair or r€plaæ hos* âs
2. Repair or replace câp as
3, Bepâir or replâce as nee$âry
4. Repâir or r€p ace as necessary
5, Rêpair or replâce as necessary
B) From under hood - Pedorm
pre$ure check to d€termlne
1 .
2.
Liquid nrel leaking from fuel
l i n e s , t u e l p u m p o r c a r b u r e t o r
Cracked or damaqed cênisteB
3, Inoperative bowl vent !.lve
(see Bowl Vent Check Pro-
4, lnoperative purge valve
hee Purse Valve Check Pro-
5. Disconnected, mkroured,
kinked, deteriorated or
damaged vapor hoses or
6, Bowl vent hose misroùted
7. Air cleaner or air cleaner
gâsket improperly seated
8. Leaking or inoperative tank
pressure contro vêlve
T i g h t e n f u e i n e s . r e p a i r o r
.êplace fuel pump or carburetor
Bepair or replace ianiste6 as
Repair or replace hoses
Repair or replace hoses
Check for proper connectiôns,
and check routing as well as
condition, Correct as necessary
Reroute hôse withoût low spots
Aeinstall air cleaner and/or
Bepair or replace as necessary
5 .
8.
2.
3.
6 .
7 .
P o o r i d l e o r d r i v e a b i l i t y
o r d r i v e a b i l i t y s l u g g i n g
1, Inoperêtive purge valve
Gee Purse Valve Check
2. Inoperâlive bowl vent valve
kee Bowl Vent Ch€ck Pro-
3. Vacuum leak at tank pre$ure
1. Replace or repair hoses
2, Repâir or replace hôses
3. Repâir or replace hoses and/or
(Lo$ of rank côpachy)
1. Plussed or pinched vapor
pipe or hos6 and defective
2. Canister filter plùgsêd and
3. Plugged or ruptured diaphragm
in tank pressure control valve
Check all i.es frorn tank to
c a n i s t ê r a n d r e p l a c e € p
2 . F e p l â c ê f i l t e r i n c a n i s t e r ' a n a
3, Replace tank pressure conùol
F i s . 6 C 1 - 1 o - . E v a p o r â t i v e
C o n t r o l S y s r ê n D i a g n o s i s