TOHATSU TLDI MD 115A SERIES, Руководство по обслуживанию

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Fuel System (TLDI)
4-16 TLDI 115A 2007
6
HIGH PRESSURE FUEL FIL
TER
0
THR
O
TTLE BOD
Y
4
V
APOR SEP
ARA
T
O
R
7
AIR RAIL
w
AIR COMPRESSOR
e
AIR REGULA
T
O
R
0.55MP
a
3
FUEL PUMP
FUEL FIL
TER
8
FUEL REGULA
T
O
R
0.070MP
a+AIR PRESSURE
1
FUEL T
ANK
r
CYLINDER
q
AIR FIL
TER
0.55MP
a
#3 cr
ank case
#4 cr
ank case
0.01MP
a
CHECK V
A
LV
E
0.62MP
a
0.025MP
a
2
5
F.
F.
P
9
F.
F.P CASE
When the engine starts, the fuel pump
3
operates to feed gasoline from fuel tank
1
to vapor separator
4
through the fuel filter
2
.The gasoline is compressed with FFP
5
, sent to air rail
7
through high pressure fuel filter
6
and then, injected into the
combustion chamber. The pressure of
5
to
7
are controlled by the fuel regulator
8
so that the gasoline differential pressure is kept to 0.070MPa (10psi) for proper combustion. The gasoline that is not used here is decompressed and returned to
4
through FFP case
9
. The returned gasoline contains small amount of air bubbles
that are produced when the gasoline was compressed with
5
. The air bubbles are
sent to the throttle body
0
from upper part of
4
and are sucked as intake air of the
engine. In the same way, when the engine starts, the air compressor
w
operates to suck air
through air filter
q
. Moreover, the air that is compressed with
w
is sent to the air rail
7
, and injected into the fuel combustion chamber through air injectors.
The air pressure is controlled to 0.55MPa (80psi) by the air regulator
e
to maintain
appropriate combustion. The air that is not used here is decompressed and disposed to exhaust passage of the cylinders
r
.
Fuel / Air Feed System
MD115A̲ch04̲E̲2校̲070605.qxd 07.6.6 5:42 PM ページ 16