SECTION21—GASOLINEVEHICLE-FUELSYSTEM
21
GasolineVehicle-FuelSystem
DANGER
•SeeGeneralWarningsonpage1-2.
WARNING
•SeeGeneralWarningsonpage1-2.
WARNING
•Fuelmaybeunderpressure.Useextremecautionwhendisconnectingfuellinetopreventthesprayof
fuelontohotengine.
GENERALINFORMATION
Theengineisequippedwithathrottlebody/fuelinjectorassemblythatiscontrolledbyanECUandrequiresno
adjustment.TheECUmonitorsengineconditionsthroughinputsfromaManifoldAbsolutePressure(MAP)sensor,
engineblocktemperaturesensorandignitiontiming.
EFISYSTEMFEATURES/SPECIFICATIONS
•Thefuelpumpoperatingpressureis50psi+/-3.TheKohlerfuelpressuregaugehasapsivarianceof+/-3.
•FuelpumpoperatesforafewsecondswhenkeyswitchisturnedtotheONposition;itstopsifnoengineRPM
isdetectedbytheECU
•TheECUindicatesafaultcodethroughthemalfunctionindicatorlight(MIL)
•In-tankfuelpump
•Return-lesssystem
•Highfuelpressuresystem
•Controlsfuelpump,fuelinjector,andoillamp
•Automaticaltitudecompensation
•Closed-loopsystem(includesoxygensensor)
•SeparateEFIwireharness
•Fail-safefunction
2020Precedent,Villager2and4MaintenanceandServiceManualPage21-1