Majekeseni amafuta amagwira ntchito yofunika kwambiri pamainjini a dizilo. Imakhala ndi udindo wobaya mafuta m'chipinda choyaka moto cha injini ndikukakamiza, nthawi ndi atomization. Kupyolera mu kuwongolera koyenera kwa jakisoni wamafuta, zimatsimikiziridwa kuti mafuta amatha kusakanizidwa bwino ndi mpweya, potero amapeza kuyaka bwino.

Injector yamafuta imatha kusintha molondola kuchuluka ndi nthawi ya jekeseni wamafuta molingana ndi machitidwe osiyanasiyana ogwiritsira ntchito injini, monga liwiro, katundu, ndi zina. Imani mafuta mwachangu poyambira kuti muwonetsetse kuyatsa kosalala; kuwonjezera kuchuluka kwa jekeseni wamafuta pa katundu wambiri kuti apereke mphamvu zokwanira; kuchepetsa kuchuluka kwa jekeseni wamafuta pa katundu wochepa kuti apulumutse mafuta. Kuchita bwino kwa jekeseni wamafuta kumathandiza kukonza mphamvu ya injini, chuma chake komanso kutulutsa mpweya. Zingapangitse kuyaka kukhala kokwanira, kuchepetsa mpweya woipa umene umabwera chifukwa cha kuyaka kosakwanira, komanso kulola injini kutulutsa mphamvu zamphamvu kwambiri. Kuphatikiza apo, kuwongolera moyenera ma jakisoni amafuta kumathanso kuchepetsa kugwiritsa ntchito mafuta ndikuwongolera kugwiritsa ntchito mafuta. Mitundu yosiyanasiyana ndi majekeseni a majekeseni amagwirizana ndi mapangidwe osiyanasiyana a injini ndi zofunikira zogwiritsira ntchito, ndipo palimodzi zimatsimikizira kuti injiniyo ikugwira ntchito mokhazikika komanso yodalirika.

Kulephera kwa jekeseni wamafuta kumaphatikizapo izi:
Kusakwanira kwa ma atomu: Zotsatira zake, mafuta sangapangike bwino, zomwe zimakhudza kuyaka bwino, zomwe zingapangitse mphamvu ya injini kutsika, kugwiritsa ntchito mafuta kuchulukirachulukira, komanso kutsika kwa mpweya.
Kudontha: Mafuta amadontha mosalekeza kuchokera ku jekeseni, zomwe zimapangitsa kuti kusakaniza kukhala kolemera kwambiri, kuchititsa injini kuyenda mokhazikika, kugwedezeka, ngakhale kuyamba movutikira.
Kutsekeka: Zinyalala ndi zinthu zina zimatha kutseka mabowo a jakisoni kapena ngalande zamkati za jekeseni, zomwe zimapangitsa kuti jekeseni wamafuta achepe kapenanso jekeseni wopanda mafuta, zomwe zimayambitsa mavuto monga kusakwanira kwa injini ndi kusowa kwa silinda.
Kuthamanga kwa jekeseni wamafuta: Kuthamanga kwambiri kapena kutsika kwambiri kumakhudza jekeseni wamafuta, zomwe zimapangitsa kuyaka kosakwanira kapena kusagwira bwino ntchito kwamagetsi.
Kulephera kwa koyilo ya Solenoid: monga kufupika kwa koyilo, kuzungulira kotseguka, ndi zina zambiri, kumapangitsa kuti jekeseniyo alephere kugwira ntchito bwino.
Sino ya valve yomata: Itha kulepheretsa jekeseni yamafuta kuti isatseguke kapena kutseka bwino, zomwe zimapangitsa kuti jekeseni wamafuta aziyenda bwino.