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Home >> Kia >> 2003 >> Optima SE, 2.7 8 >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Fuel System >> Fuel Delivery - Conventional System >> Notes
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Fuel Delivery - Conventional System: Notes

Fuel is pumped from fuel tank mounted fuel pump through fuel rail to fuel injectors. Variable pressure regulator is mounted on fuel rail to control injector fuel pressure to about 40.5 psi (290 kPa) above manifold absolute pressure. Excess fuel is returned from fuel rail to fuel tank. System minimizes vapor lock by keeping fuel moving through fuel rail.