Table of Contents
Advertisement
FUEL SYSTEM
C O N T E N T S
Page
Page
ACCELERATOR PEDAL AND THROTTLE
FUEL TANKS
9
CABLE
.15
GENERAL DIAGNOSIS
31
DUAL POINT FUEL INJECTION
17
SERVICE PROCEDURES
47
FUEL DELIVERY SYSTEM
. . . 3
GENERAL INFORMATION
T h r o u g h o u t t h i s group, references m a y be made t o
a p a r t i c u l a r vehicle by letter or n u m b e r designation.
A c h a r t showing the breakdown o f these designations
is included i n the I n t r o d u c t i o n Section a t the front o f
t h i s service m a n u a l .
The Fuel System consists of t h e fuel t a n k , fuel
p u m p , fuel filter, t h r o t t l e body, fuel lines a n d vac-
u u m lines.
The F u e l D e l i v e r y S y s t e m consists o f t h e fuel
p u m p , fuel pressure regulator, fuel f i l t e r , fuel tubes,
fuel hoses, and fuel injectors.
The F u e l T a n k A s s e m b l y consists o f t h e fuel
t a n k , filler tube, a fuel gauge sending u n i t assembly
a n d a pressure-vacuum f i l l e r cap.
Also, to be considered p a r t o f t h e fuel system is the
E v a p o r a t i o n C o n t r o l S y s t e m , w h i c h is designed to
reduce t h e emission of fuel vapor i n t o t h e atmo-
sphere.
The description a n d function o f t h e Evaporation
Control System is found i n Group 25 o f t h i s m a n u a l .
FUEL
REQUIREMENTS
Y o u r vehicle was designed a n d developed for opti-
m u m
operating performance
a n d efficiency
u s i n g
h i g h q u a l i t y unleaded gasoline.
I n order t o r e t a i n t h e o p t i m u m performance quali-
ties and enjoy trouble-free operation o f y o u r vehicle,
i t i s recommended t h a t only gasolines f r o m reputable
dealers be used.
Use unleaded gasolines h a v i n g a m i n i m u m octane
r a t i n g of 87, (R + M ) 12.
Should your vehicle develop spark knock (ping),
purchase your fuel from another source. Vehicles
m a y respond differently to gasolines h a v i n g the same
octane r a t i n g . Occasional trace knock a t l o w engine
speeds is n o t h a r m f u l . However, continued knock a t
h i g h speeds can damage y o u r engine a n d should be
reported to your dealer i m m e d i a t e l y . Engine damage
as a result o f prolonged operation of a vehicle w i t h
continuous h i g h speed knock m a y not be covered b y
t h e new vehicle w a r r a n t y .
I n addition to u s i n g unleaded gasoline w i t h t h e
proper octane r a t i n g , gasolines t h a t contain deter-
gents and anti-corrosion additives are recommended.
The use of gasoline c o n t a i n i n g these additives help
improve fuel economy, reduce emissions a n d m a i n -
t a i n vehicle performance.
Low q u a l i t y fuel can cause problems such as h a r d
s t a r t i n g , stalling, a n d d r i v e a b i l i t y deterioration. I f
problems of this type are experienced, i t is recom-
mended t h a t another b r a n d o f gasoline be used prior
to considering service for t h e vehicle.
The exhaust emission system o f your vehicle is de-
signed to meet a l l emission regulations w h i l e a t t h e
same t i m e providing excellent fuel economy. Catalyst
systems require t h a t only unleaded gasoline be used.
Use of leaded fuel w i l l not o n l y destroy t h e effective-
ness of the catalytic converter used t o reduce exhaust
emissions, b u t w i l l also m a k e p a r t of the fuel control
system inoperative a n d lead t o h i g h fuel consump-
t i o n .
A l l vehicles have w a r n i n g labels on the i n s t r u m e n t
panel and adjacent to t h e fuel filler cap o r door t h a t
state U N L E A D E D
F U E L
O N L Y . These vehicles
also have fuel f i l l e r tubes designed to accept only the
unleaded gasoline dispensing nozzle. Damage result-
i n g from the use of leaded gasoline m a y n o t be cov-
ered by the new vehicle w a r r a n t y .
GASOLINES
CONTAINING
ALCOHOL
Y o u r vehicle was designed a n d developed for opti-
m u m operating performance a n d efficiency u s i n g gas-
oline. Some fuel suppliers sell gasoline/alcohol blends
as motor vehicle fuel. The type and a m o u n t o f alco-
h o l used i n the blend is i m p o r t a n t . M a n y states re-
quire t h a t the service
s t a t i o n pumps dispensing
gasoline containing alcohol be properly labeled w i t h
the type and amount of alcohol present. I f y o u r state
does not have t h i s requirement, we recommend t h a t
you ask t h e gasoline s t a t i o n operator i f t h e i r fuel
contains alcohol and i f so, w h a t type and amount.
The following t w o types o f alcohols are generally
used i n gasoline blends:
E T H A N O L ( E t h y l or G r a i n Alcohol) is used as a
m i x t u r e of 10 percent e t h a n o l a n d 90 percent u n -
leaded gasoline and identified as "ethanol enhanced",
"contains ethanol", or "gasohol". Gasoline blended
Advertisement
Table of Contents
