1. Engine
  2. Engine Controls - 1.9L
  3. Diagnostic Information and Procedures
Fuel System Diagnosis

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Energizing the Fuel Pump

All of the fuel system tests will require operation of the fuel pump to measure pressure, evaluate pressure decay, or perform the pressure at calibrated flow tests.

Although the fuel pump can be controlled with the ignition, this is fairly awkward for the following rea...

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Service Manual Table of Contents

Document Tags

Document Title: Fuel System Diagnosis

energizing

fuel

pump

system

pressure

evaluate

decay

flow

ignition

this

following

energized

wait

seconds

required

vehicle

hoist

control

important

scan

tool

will

times

running

tips

shut

testing

diagnostic

chart

provide

engine

designed

supply

must

deliver

adequate

volume

maintain

turned

leakage

injector

battery

diagnosis

hard

start

extended

power

idle

voltage

volts

published

test

from

volts

when

maximum

available

whether

operating

determine

regulated

load

conditions

open

throttle

means

filter

regulator

using

adapter

kpa

psi

female

quick

connect

inlet

fitting

valve

connected

feed

rail

return

drain

gauge

leakdown

read

specification

prevent

allow

problem

area

intake

balance

drop

cycle

identify

sized

spray

cone

working

caution

smoking

flames

where

work

evap

taking

place

anytime

disconnect

negative

cable

whenever

line

loosened

removed

wrap

shop

cloth

approved

container

collect

remove

port

present

assure

check

electrical

induction

tube

relieve

minimum

performing

charge

proceeding

energize

record

repeat

procedure

compare

recorded

result

appropriate

decision

before

clip

attachment

mmhex

notice

properly

utilize

zero

reading

appropriately

connector

hook

sure

firmly

latched

hose

turn

times

position

minutes

after

subtract

step

loss

assembly

clean

faulty

install

bleed

noid

lite

tester

average

difference

cylinder

fuel system

pressure decay

pump energized

pressure flow

system fuel

fuel injectors

fuel supply

maintain pressure

fuel injector

test fuel

system pressure

pressure test

pump flow

flow pressure

tests determine

fuel pressure

filter pressure

regulator fuel

fuel flow

flow control

test adapter

fuel feed

fuel rail

fuel return

pressure gauge

shut fuel

injector balance

balance test

test vehicle

caution allow

allow smoking

smoking open

open flames

flames area

work fuel

fuel evap

evap system

system taking

anytime work

system disconnect

negative battery

cable tests

tests battery

battery voltage

caution whenever

whenever fuel

fuel line

line fittings

fittings loosened

cloth fitting

fitting approved

available collect

collect fuel

test port

fuel gauge

this test

test determine

required remove

relieve fuel

important battery

battery minimum

minimum volts

volts when

performing fuel

system test

test charge

charge battery

battery proceeding

volts energize

energize fuel

pump minimum

seconds energizing

record fuel

pressure fuel

procedure minimum

minimum times

compare pressure

recorded published

test result

determine fuel

test caution

required important

remove fuel

feed line

fuel disconnect

disconnect fuel

utilize fuel

must connected

connected fuel

line inlet

adapter fuel

line connected

connected flow

connected properly

properly zero

zero pressure

pressure reading

read appropriately

appropriately sized

sized connector

connector fittings

fittings hook

adapter feed

feed return

return lines

lines connect

connect fuel

gauge test

valve test

minimum kpa

minimum times

connect scan

system leakdown

leakdown test

pump wait

wait minutes

test maximum

maximum pressure

decay after

pressure subtract

subtract pressure

recorded step

pressure loss

loss decay

decay published

flow valve

start engine

fuel system tests

tests outlined fuel

fuel supply system

maintain pressure engine

pressure engine fuel

engine fuel pump

test fuel pump

fuel pump operational

pump operational test

fuel pump operating

fuel system pressure

system pressure test

fuel pump flow

pump flow pressure

flow pressure tests

pressure regulator fuel

fuel flow pressure

fuel injector balance

injector balance test

pressure delivered fuel

caution allow smoking

allow smoking open

smoking open flames

open flames area

where work fuel

work fuel evap

fuel evap system

evap system taking

system taking place

place anytime work

fuel system disconnect

system disconnect negative

disconnect negative battery

cable tests battery

tests battery voltage

caution whenever fuel

whenever fuel line

fuel line fittings

line fittings loosened

fittings loosened removed

shop cloth fitting

cloth fitting approved

fitting approved container

available collect fuel

collect fuel remove

fuel pressure test

pressure test port

this test determine

tube relieve fuel

relieve fuel system

port important battery

important battery minimum

battery minimum volts

minimum volts when

performing fuel system

fuel system test

system test charge

test charge battery

charge battery proceeding

volts energize fuel

energize fuel pump

fuel pump minimum

seconds energizing fuel

record fuel pressure

fuel pressure fuel

pressure fuel pump

repeat procedure minimum

compare pressure recorded

pressure recorded published

fuel system diagnosis

fuel supply chart

test result appropriate

flow pressure test

test caution allow

required important battery

remove fuel feed

fuel feed line

feed line retainer

line retainer clip

retainer clip attachment

clip attachment screw

collect fuel disconnect

fuel disconnect fuel

disconnect fuel feed

feed line fuel

line fuel rail

properly utilize fuel

utilize fuel flow

pressure test adapter

must connected fuel

connected fuel feed

feed line inlet

adapter fuel return

fuel return drain

line connected flow

connected flow control

connected properly zero

properly zero pressure

zero pressure reading

read appropriately sized

appropriately sized connector

sized connector fittings

connector fittings hook

adapter feed return

feed return lines

return lines connect

test adapter fuel

connect fuel pressure

fuel pressure gauge

pressure gauge test

gauge test adapter

turn valve test

valve test adapter

fuel pressure flow

pressure flow fuel

minimum kpa psi

procedure minimum times

test vehicle raised

vehicle raised hoist

means controlling fuel

controlling fuel pump

fuel pump vehicle

required scan tool

scan tool readily

tool readily provides

readily provides function

fuel pump caution

pump caution allow

volts connect scan

connect scan tool

scan tool vehicle

tool vehicle ignition

comfortable working position

working position caution

position caution whenever

lines fuel filter

fuel filter pressure

regulator notice properly

test adapter feed

adapter feed return

lines sure connections

sure connections firmly

connections firmly latched

adapter fuel pressure

using scan tool

fuel system leakdown

system leakdown test

test determine fuel

induction tube caution

tube caution whenever

collect fuel relieve

fuel relieve fuel

fuel pressure port

manual record fuel

minimum times shut

times shut fuel

shut fuel pump

fuel pump wait

pump wait minutes

leakdown test maximum

test maximum pressure

maximum pressure decay

pressure decay after

fuel pressure subtract

pressure subtract pressure

compare pressure loss

pressure loss decay

loss decay published

turn flow valve

fuel rail assembly

remove fuel gauge

start engine check

engine check leaks