Pontiac Fiero 1988 Service Manual page 372

FUEL SYSTEM 6C-1
SECTION 6C
E I I C B
C V Q T P M
CONTENTS
G E N E R A L D E S C R I P T I O N
Fuel System Pressure Relief 6C-1
Fuel System 6C-2
Fuel Metering 6C-2
Throttle Body Injection (TBI) 6C-2
Multi Port Fuel Injection (MPFI) 6C-2
Electric Fuel Pump 6C-2
Fuel Pump Relay 6C-2
Fuel Filler Cap 6C-2
Fuel Tank 6C-2
Fuel Gage Sender 6C-2
Fuel and Vapor Pipes 6C-2
Accelerator Controls 6C-3
Accelerator Control Cable 6C-4
Accelerator Pedal 6C-4
Evaporative Emission Control System
(EECS) 6C-4
Canister Purge Valve and Solenoid ................. 6C-6
Fuel Tank Pressure Control Valve 6C-6
D I A G N O S I S
Inspection of Fuel System ................................ 6C-6
Fuel System Pressure Test - 2.5L-TBI
Engine (LR8) 6C-6
Fuel Pump Flow Test - 2.5L-TBI
Engine (LR8) 6C-7
Fuel System Pressure Test -2.8L MPFI
Engine (L44) 6C-7
Fuel Tank and Lines 6C-7
Canister Purge Valve Test 6C-7
Fuel Tank Pressure Control Valve 6C-7
Pressure Checking EEC System 6C-7
Evaporative System Pressure Test 6C-7
O N C A R S E R V I C E
Fuel Pressure Relief Procedure 6C-8
Fuel Tank Draining 6C-8
Fuel System Cleaning 6C-8
Fuel Tank Leak Test 6C-9
Fuel Tank Replacement 6C-9
Fuel Tank 6C-9
Removal 6C-9
Installation 6C-9
Fuel Gage Sending Unit 6C-9
Removal 6C-9
Installation 6C-9
Fuel, Fuel Return & Emission Pipe
Repair or Replacement 6C-9
Vapor Canister 6C-10
Removal 6C-10
Installation 6C-10
Canister Filter 6C-10
Replacement
6C-10
Fuel Pump Replacement 6C-10
Removal 6C-10
Installation 6C-10
Accelerator Controls 6C-10
Accelerator Pedal 6C-10
Accelerator Control Cable 6C-10
A L L N E W G E N E R A L M O T O R S V E H I C L E S A R E C E R T I F I E D B Y T H E U N I T E D S T A T E S
E N V I R O N M E N T A L P R O T E C T I O N A G E N C Y A S C O N F O R M I N G T O T H E R E Q U I R E M E N T S O F
T H E R E G U L A T I O N S F O R T H E C O N T R O L O F A I R P O L L U T I O N F R O M N E W M O T O R V E H I C L E S .
T H I S C E R T I F I C A T I O N I S C O N T I N G E N T O N C E R T A I N A D J U S T M E N T S B E I N G S E T T O
F A C T O R Y S T A N D A R D S . I N M O S T C A S E S , T H E S E A D J U S T M E N T P O I N T S E I T H E R H A V E
B E E N P E R M A N E N T L Y S E A L E D A N D / O R M A D E I N A C C E S S I B L E T O P R E V E N T
I N D I S C R I M I N A T E O R R O U T I N E A D J U S T M E N T IN T H E F I E L D . F O R T H I S R E A S O N , T H E
F A C T O R Y P R O C E D U R E F O R T E M P O R A R I L Y R E M O V I N G P L U G S , C A P S , E T C . , F O R
P U R P O S E S O F S E R V I C I N G T H E P R O D U C T M U S T B E S T R I C T L Y F O L L O W E D A N D ,
W H E R E V E R P R A C T I C A B L E , R E T U R N E D T O T H E O R I G I N A L I N T E N T O F T H E D E S I G N .
GENERAL DESCRIPTION
FUEL S Y S T E M PRESSURE RELIEF
C A U T I O N : T o r e d u c e t h e r i s k o f f i r e
a n d p e r s o n a ! i n j u r y , it i s n e c e s s a r y t o
r e l i e v e t h e f u e l s y s t e m p r e s s u r e
b e f o r e s e r v i c i n g f u e l s y s t e m
c o m p o n e n t s . T o d o t h i s :
2.5L-TBI ENGINE (LR8)
• Remove "Fuel Pump" fuse from fuse block in
passenger compartment.
• Crank engine; engine will start and run until fuel
supply remaining in fuel lines is consumed.
Engage starter for 3.0 seconds to assure relief of
any remaining pressure.
• With ignition "OFF", replace fuel pump fuse.
U n l e s s t h i s p r o c e d u r e i s f o l l o w e d b e f o r e
s e r v i c i n g f u e l l i n e s o r c o n n e c t i o n s , f u e l s p r a y
c o u l d o c c u r .
2.8L-MPFI ENGINE (L44)
For MPFI fuel system pressure relief procedure,
see Section 6E3.
When repair to the fuel system has been
completed, start engine and check all connections that
were loosened for possible leaks.