Uhlelo lokuphakela uphethiloli lwakhiwa ikakhulukazi ithangi likaphethiloli, iphampu kaphethiloli, isivimbeli sikaphethiloli, isilawuli sokucindezela uphethiloli, isihlungi sikaphethiloli, isijovo, iswishi sokulawula izinga lokushisa kanye nevalvu yokuqala ebandayo. Lezi zingxenye zisebenza ngokubambisana ukuqinisekisa ukuthi injini iyakwazi ukuthola inani elifanele likaphethiloli ngaphansi kwezimo ezihlukahlukene zokusebenza.
Ohlelweni lokuhlinzeka ngophethiloli, iphampu yamafutha idlala indima ebalulekile. Unomthwalo wemfanelo wokukhipha uphethiloli ethangini likaphethiloli bese ulethwa kumjovo. Ngokwendawo yokufaka, iphampu yamafutha ingahlukaniswa ibe yipompo yangaphandle kanye nepompo yangaphakathi. Iphampu yangaphandle ifakwe epayipini likawoyela, kuyilapho iphampu yangaphakathi ifakwe ngokuqondile ngaphakathi kwethangi likaphethiloli.
Ngaphezu kwalokho, isihlungi sikaphethiloli siyingxenye ebalulekile yesistimu. Itholakala kumjikelezo kawoyela phakathi kwe-fuel buffer kanye ne-injector. Umsebenzi wayo oyinhloko ukuhlunga amanzi nokungcola kuphethiloli ukuze kuvinjwe lokhu kungcola ekuvaleni ivalve yenaliti yomjovo. Lo msebenzi uqinisekisa ukusebenza okuvamile kwe-injector, futhi ngaleyo ndlela kuqinisekisa ukuzinza nokuthembeka kwalo lonke uhlelo lokuhlinzeka ngophethiloli.
I-injector iyi-actuator eyinhloko ohlelweni, enesibopho sokufafaza uphethiloli kusilinda ukuze kwakhe ingxube efanelekayo evuthayo. I-fuel pressure regulator ilungisa umfutho kaphethiloli ngokwezidingo zenjini ukuqinisekisa ukuthi umjovo uyakwazi ukufafaza inani elifanele likaphethiloli.
Ngaphezu kwalezi zingxenye ezingenhla, izakhi ezifana ne-switch control control kanye ne-valve yokuqala ebandayo nazo zidlala indima ebalulekile. Balungisa uphethiloli ngokwezinga lokushisa kanye nesimo sokusebenza kwenjini ukuze baqinisekise ukuthi injini ingathola inani elifanele likaphethiloli ngaphansi kwezimo ezihlukahlukene. Umsebenzi odidiyelwe walezi zingxenye wenza uhlelo lokuphakela uphethiloli lunikeze ukutholakala kukaphethiloli okuzinzile enjinini, ngaleyo ndlela kuqinisekiswe ukusebenza nokwethembeka kwenjini.