MEFI Fuel Injection
New for 2003 and Beyond 2003 IAFM MPFI Models 4.3 GXi
5.0 GXi
5.7 GXi
The acronym (first used in 2003) IAFM stands for a new multi port fuel injection system called Integrated Air Fuel Module. This is a combination of intake manifold, throttle body, and injectors. This setup changes these engines from TBI to MPI type engines. With this new system, Volvo Penta has increased the power output of our marine gasoline engines up to 20 more HP. With power ratings of up to 320 HP, the upgraded engines become faster and more reliable. In Fall of 2001 Volvo Penta stopped producing throttle body injected gasoline engines. For 2005 we offer carbureted and Multi-port Fuel Injected (MFI) engines. In carbureted engines, Volvo Penta offers the 3.0GL, 4.3GL, 5.0GL and the 5.7GL In the IAFM multi port configuration, Volvo Penta offers the six cylinder 4.3L, the V8 small block 5.0L, and the 5.7L. The big block 8.1L is again offered as MPFI, although it is not of IAFM configuration. For 05, the 8.1L uses a returnless fuel system. There is only one fuel line to the fuel rail and the pressure regulator has been moved from the fuel rail to the fuel pump module.
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