Great Wall GW491QE, Service Manual

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EF.1-23
(g)Technical฀&characteristic฀parameter
฀฀฀฀Limit฀data
1.฀end฀cover฀of฀oil฀pump
2.฀armature
3.฀oil฀passage
4.฀impeller
United฀Electronic฀engine฀management฀system-Analysis฀of฀function฀/principal฀/
failure฀for฀system฀parts฀&components
12.฀Electrical฀fuel฀pump฀EKP
(a)Function to฀transfer฀the฀fuel฀from฀fuel฀tank฀to฀engine,฀and฀to฀produce
a฀sufficient฀fuel฀pressure,฀and฀excessive฀fuel.
(b)฀฀Principal Being฀one฀type฀of฀vane฀pumps฀driven฀by฀DC฀motor,฀the
fuel฀pump฀is฀installed฀inside฀fuel฀tank,฀and฀submerged฀under฀fuel,฀and฀its
lubrication฀and฀heat฀elimination฀may฀be฀effected฀using฀fuel;฀The฀accumulator
will฀provide฀a฀power฀supply฀to฀electrical฀fuel฀pump฀via฀pump฀relay,
which฀will฀connect฀the฀loop฀of฀electrical฀fuel฀pump฀only฀when฀the฀engine
is฀running฀or฀during฀a฀starting฀process;฀Whereby฀the฀engine฀stops฀running
due฀to฀accident,฀the฀fuel฀pump฀will฀auto.฀stop฀working.
(c)Installation฀position:฀inside฀fuel฀tank.
(d)Symptom
L a r g e ฀ r u n n i n g ฀ n o i s e s , ฀ b a d ฀ a c c e l e r a t i o n ,
unableto฀start(start฀with฀difficulty),฀etc.
(e)Cause฀ of฀ general฀ failures The฀ use฀ of฀ inferior฀ fuel฀ might
result฀in:
-An฀insulation฀layer฀formed฀by฀accumulative฀colloid;
-A฀dead฀hug฀of฀bearing฀bush฀with฀armature฀of฀oil฀pump;
-Corrosion฀of฀oil-level฀sensor฀components.
V alue
M easurement
M in. T ypical M ax .
U nit
S torage temperature w hen w ith original pack age -40 +70
A llow able temperature of injector inside vehicle
w hen not w ork ing
+140
C ontinuous -40 +110
W ork ing
temperature of
injector
W ithi n a short-ti me period
about 3minutes after heat
starting process
+130
C ontinuous +70 A llow able fuel
temperature at the
inlet mouth of
injector
S hort time ( A bout three minutes) +100
T he dev iation of fuel f low at
may result in a 5% temperature
-40 +45
A llow able leak age of O ring w hen w ithin -35~-40
F uel moisture content rather than
dripping w ithi n O ring area is allow ed.
M ax allow able vibration acceleration peak v alue
400 m/s
2
S upply voltage
6 16 V
I nsulation resistance 1 M
B earable internal f uel pressure 1100 kP a
B earable bending stress 6 N · m
B earable ax ial stress 600 N
Characteristic฀data
Value
Quantity
Min. T ypical Max.
Unit
Working pressure Pressure difference 300 kPa
Injector resistance at 20 11.4 12.6
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