A cikin tsarin MPI, masu allura sun kasu kashi-kashi, kuma ana kunna masu allurar a cikin rukuni ɗaya a lokaci guda. Misali, allurar injin silinda 4 sun kasu kashi biyu, kowane rukuni na allura biyu, wadannan rukuni biyu na allura suna fesa mai, injin injin a kowane juzu'i akwai rukuni na allura suna fesa mai. An haɗa wannan tsarin na injectors a cikin layi daya, ECU kawai a kan rukuni ɗaya na duk injectors suna aika sigina iri ɗaya, masu injectors suna cikin lokaci guda don buɗewa da rufewa, shirye-shiryen yana da sauƙi don sauƙaƙe tsarin lantarki, amma yana da. don yanayi daban-daban na injin rashin canje-canje na bazuwar a cikin aikin, wanda zai haifar da abin da ya faru na stagnation na man fetur da iskar gas a cikin nau'in cin abinci.

Tsarin SFI, kowane injector kai tsaye yana da alaƙa da ECU, bi da bi, ana iya yin shi daidai kafin buɗe bawul ɗin ɗaukar injector, ana iya yin injector tsakanin lokacin allura biyu nan take daidaitawar cakuda don dacewa da canje-canje a cikin yanayi daban-daban. . Saboda haka, SFI ita ce hanya mafi inganci kuma mafi dacewa ta tsarin allurar mai sarrafa man fetur mai lamba da yawa, yawancin injunan motoci suna amfani da wannan hanyar.