燃油系统(fuel system)

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燃油系统（

fuel system

）

燃油系统

（

fuel

system

）

Fuel

lift

up

and

put

down

is

called

weight

lifting,

lift

up

and

put

down

is

called

weight.

The

head

must

have

the

courage,

the

rise

should

be

emboldened.

Learning

to

add,

proud

to

be

reduced,

the

opportunity

to

travel,

in addition to lazy to. The three problems of life: thinking,

love, Unrequited love. First, training objective: 1) master

the rapid diagnosis method of oil pressure relief method and

circuit fault 2) master the maintenance method of electric

fuel pump and fuel injector fuel system Two, the content of

training: 1)

the

oil pressure

relief

system 2)

detection

of

vehicle

fuel

system

3)

electric

fuel

pump

inspection

and

testing 4)

inspection

and

testing

of

electromagnetic

injector

Three,

training

equipment,

tools

and

materials Santana

2019,

the

fuel

pump

assembly,

fuel

injector

assembly.

The

oil

pressure

gauge,

digital

multimeter,

manual

vacuum

pump,

injector

cleaning

machine,

common

tools,

with

scales,

containers, cotton yarn, gasoline, wire etc. Four, training

operation:

1,

the

oil

pressure

relief

system

From

the

entrance of the fuel filter pressure relief pipe joint The

pressure relief valve pressure relief The dynamic pressure

1

/

8

relief The injector with pressure relief The manual vacuum

pump with pressure relief Detection of 2, the fuel system of

the car 1) in the power supply voltage is not less than 12V,

switch

off

the

ignition,

remove

the

battery

strap. 2)

pressure

gauge

pressure

relief

after

loading

of

gasoline,

gasoline

pump

power and short circuit. 3) put on the battery strap, the

ignition

switch

is

in

the

ON

position,

the

gasoline

pump

pressure test. If the pressure is too high, then replace the

pressure

regulator;

if

the

pressure

is

too

low,

then

check

the

fuel pump, fuel filter and pressure regulator for leaks. 4)

the

ignition

switch

for

the

OFF

position,

remove

the

fuel

pump

short wiring. 5) to start the engine, the idle state of the

pressure measuring system. If the oil pressure of the system

is

not

in

the

specified

range,

check

the

vacuum

tube

and

pressure

regulator.

6).

Remove

vacuum

hose

from

the

oil

pressure regulating, plug the hose. The test pressure shall

comply

with

the

provisions. 7)

off

after

five

minutes

to

check

the

oil

pressure,

such

as

drop,

check

the

fuel

pump

and

pressure

regulator for leaks. 8) pressure relief, remove the strap,

remove

the

oil

pressure

gauge. 9)

after

loading

complex

leak.

3, the fuel pump test Test the working condition of the fuel

pump

should

ensure

the

battery

voltage

is

normal,

the

gasoline

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pump

fuse

is

normal,

normal

gasoline

filter. 1)

gasoline

pump

circuit check ON (ignition means connected to the ignition

switch),

gasoline

pump

should

be

able

to

hear

the

startup

sound,

if

a

finger

pinch

pipeline

should

be

able

to

feel

the

pressure.

If the fuel pump does not start, should check the fuel pump,

gasoline

and

fuel

pump

relay

control

circuit. OFF

(meaning

the

ignition

switch

off

ignition),

fuel

pump

relay

must

have

action,

otherwise

check

the

fuel

pump

relay

line,

if

the

line

is

normal,

the replacement of fuel pump relay. If the fuel pump relay,

gasoline pump is still not working. The ignition switch is

closed,

with

a

multimeter

measuring

gasoline

pump

power

supply

voltage on the conductor, the voltage value is about normal

battery

voltage

(about

12V).

If

the

voltage

does

not

reach

the

specified value, you need to find and remove the fuel pump

circuit circuit fault; if the voltage reaches the specified

value, take the lead wire colleagues found no gasoline pump

circuit, that electric fuel pump failure, should check the

replacement

of

fuel

pump. 2)

test

gasoline

pump The

ignition

OFF from gasoline pump electric plug. The resistance meter

gasoline pump coil resistance, if not within the specified

scope, then replace the gasoline pump assembly. The power

3

/

8

supply

to

the

gasoline

pump

plus

12V

(note

the

polarity),

check

the running condition of the gasoline pump. If not normal,

replace

gasoline

pump

assembly. Note:

this

experiment

should

be

completed

to

avoid

burning

gasoline

pump

coil

in

10S,

while

the

gasoline

pump

away

from

the

battery. 3)

measuring

gasoline

pump

supply

The

ignition

OFF

The

pressure

relief

after

receiving the pressure gauge on the oil pipe. The hose to the

oil return pipe, and into the cup. The use of joint wire

shorted

fuel

pump

relay

contacts

and

battery

positive

terminal,

the

steam

pump

operation

system

hydraulic

power. The

empty

cup.

The

switch

on

the

gasoline

pump,

make

it

work.

Pump

oil

measurement

within

the

prescribed

time,

compared

to

a

predetermined

value.

If

you

do

not

reach

the

minimum

amount

of

oil, possible causes for the pipeline bending or obstruction,

gasoline pump failure

etc.. Detection of

4. injector

1)

injector inspection, (1) check the working condition of the

fuel injector when the engine is running, touch the injector

or

use

a

stethoscope

to

check

the

fuel

injector,

to

see

whether

the machine work is consistent with the engine speed. If not

normal, check the fuel injection signal ECM output. If the

fuel

injector is difficult

to

close, the method

can

be used

to

check

off

the

fire.

Check

the

action

to

be

fast,

failure

or

long