汽车专业实用英语 教学课件 作者 陈晟闽 03-fuel system.ppt

《汽车专业实用英语 教学课件 作者 陈晟闽 03-fuel system.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、WelcomeToFuel SystemOperation&DiagnosisSECTION3ObjectivesDescribethecomponentsofafueldeliverysystemandthepurposeofeach.Conductavisualinspectiononafuelsystem.Relievefuelsystempressure.Inspectandservicefueltanks.Inspectandservicefuellinesandtubing.continued…Objectiv

2、esDescribethedifferentfuelfilterdesignsandmountings.Removeandreplacefuelfilters.Explainhowcommonelectricfuelpumpcircuitswork.Conductapressureandvolumeoutputtestonamechanicalandanelectricfuelpump.Serviceandtestelectricfuelpumps.continued…FuelDeliverySystemsThefueld

3、eliverysystemhastheimportantroleofdeliveringfueltotheinjectors.Thefuelmustalsobedeliveredintherightquantitiesandattherightpressure.Thefuelmustalsobecleanwhenitisdeliveredtotheengine.continued…ATypicalFuelDeliverySystemcontinued…FuelDeliveryComponentsFueltanksConst

4、ructedofpressedcorrosionresistantsteel,aluminum,ormouldedpolyethyleneplastic.Tanksinclude;Devicesthatpreventvapourfromleavingthetank.Fuelheightcontrolsthatallowonly90%filling(somefueltankshaveanoverfilllimitingvalvetopreventoverfillingofthetank).Sloshbafflesorsurg

5、eplatestolimitfuelmovementandkeepthepickupandfuelgaugesendingunitimmersedcontinued…FuelDeliveryComponentsFillertubecaps(gascaps)Gascapsarenon-ventingandmayhavesometypeofpressure-vacuumreliefvalvearrangement.Undernormalconditions,thevalveisclosed.Whenextremepressur

6、eorvacuumispresent,thereliefvalveopens.Oncethepressureorvacuumisrelieved,thevalvecloses.continued…FuelDeliveryComponentsApressure-vacuumgasolinefillercap.continued…FuelDeliveryComponentsFuellinesThefuellinescarryfuelfromthetanktothefuelfilterandfuelinjectionassemb

7、ly.Fuellinescanbemadeofeithermetaltubingorflexiblenylonorsyntheticrubberhose.Thelattermustbeabletoresistgasoline.Thehosesmustalsobenonpermeable,sogasandgasvapourscannotevaporatethroughthehose.continued…FuelDeliveryComponentsAnexampleofasectionoffuellinesandhosesfo

8、undonalatemodelcarcontinued…FuelDeliveryComponentsFittingsFuellinesareconnectedtogetherbyfittings.Thesefittingscanbeathreaded-typefitting,quick-released