Editing Fuel injection (section)

==== Multi-point injection ====
[[File:Marvel Fuel Injection System Cross Section.png|thumb|Schematic of a mechanical port injection system]]

Multi-point injection (also called 'port injection') injects fuel into the intake ports just upstream of each cylinder's [[intake valve]], rather than at a central point within an intake manifold.<ref>{{cite web |title=Multi Point Fuel Injection or MPFI System- Working, advantages |url=https://www.enggstudy.com/multi-point-fuel-injection-system-mpfi/#Disadvantages_of_MPFI_system |access-date=26 December 2022 |date=25 November 2019}}</ref> Typically, multi-point injected systems use multiple fuel injectors,<ref name="Lohner_64" /> but some systems, such as GM's central port injection system, use tubes with poppet valves fed by a central injector instead of multiple injectors.<ref>1997 Chevrolet Truck Service Manual, page 6A-24, drawing, item (3) Central Sequential Muliport injector.</ref>