EF.1-24
UnitedElectronicenginemanagementsystem-Analysisoffunction/principal/
failureforsystemparts&components
(f)Precautionstomaintenance
-Basedonthedemandofengine,theelectricalfuelpumpmayhavevariousflowcapacities;
Duringmaintenance,PartNo.offuelpumptobere-installedshallbeconsistenttotheoriginaloneasfuelpumpslooking
alikeandabletobeinstalledmightbeinappropriate;
- Toavoidanydamage,donothavethefuelpumprunningunderadrystate;
-Incasesthatfuelpumpneedstobechanged,alwaysremembertowashthefueltankanditspipeline,andtochangethe
fuelfilter;
(g)Simplemeasurementmethod
afterdisconnectionofjoint Havethedigitalmultimeteradjustedtothe‘ohm’position,andconnecttwopenswith
twopinsoffuelpumprespectively;Themeasuredinternalresistanceshallbeaninfinitevalue namelyastateother
thanshortcircuitorbrokenloop ,oravalueotherthanzero.
afterconnectionofjoint Asfortheunitinstalledwithoil-returnsystem,connecttheoilinletpipewithfuel
manometer,andobservewhetherthefuelpumpisabletoworkwhileengineisrunning;Ifnotwork,checkthePin +
foritssupplyvoltage;Ifwork,checkwhetherthefuelpressureiswithin250-300Kpa;Whentheoilreturnpipeisbeing
clampedtightlyusingoil-returnbarrier,checkwhetheranoilpressuremaybeproducedrapidly.
(h)Technical&characteristicparameter
M easurement
V alue
M in.
Typical
M ax.
U nit
Working voltage
V (D C )
S ystem pressure
kPa
Pressure at exhaust point
kPa
A mbient temperature
(applicable to storage and transport)
A llowable fuel temperature
A llowable vibration acceleration
m/s
2
13.FuelpressureadjustorDR
Principal:Thepressureadjustorisofamembranetypedoverflowvalve:Oncethesystemfuelpressureisincreased
toadegreethatthefuelpressureinsideoilinletmouthisgreaterthanaresultantforceofthepre-tensionedspringforce
andtheairpressureforceinsidespringchamber,themembranewillbesupportedtoopenthevalvesothatthefuelcould
overflowviaanfuelreturnmouthatthecenterofpressureadjustor,andreturntothefueltank,whichwillresultina
decrementoffuelpressureuntilthevalveisclosed.
(b)Installationposition:Theunitinstalledwithoil-returnsystem
shall be installed onto the fuel distributing pipe assembly.
(c)Symptom Thefuelpressureistoolowortoohigh,orhardto
start,etc.
(d)Causeofgeneralfailures Along-termusewithoutservice
resultsin
-Ablockageonfilterscreen;
-Amajorleakagecausedbygrainedforeignmaterials;
-Anartificalmechanicaldamage,etc.
(e)Precautionstomaintenance
Duringmaintenance:
Duringmaintenance:
-It’sprohibitedtousehighlypressurizedgastoimpactthemembrane
elements;
-It’sprohibitedtousestrongcorrosiveliquidforwashingpurpose;
-It’sprohibitedtoapplyanyforcecausingpossibledeformation.
(f)Simplemeasurementmethod
Connectthefuelinletpipewithfuelmanometerbeforeengineis
started;Havetheenginerunningatidle-speed,andcheckwhether
thefuelpressureisatabout260Kpa;Havetheenginerunningat
speed2000r/min,pulloutthefuelpressureadjustor,andcheck
whetherthefuelpressureisat300Kpa.
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