POWERTRAIN SYSTEMS

Delphi Multec® Multi-Port Fuel Injection
Fuel Rail Assemblies
Delphi Multec® Multi-Port Fuel Injection (MPFI) Fuel Rail
Assemblies are integrated, pre-assembled conduits that transfer
fuel from a vehicle's chassis fuel line and distribute it to each fuel
injector location at the engine. Delphi offers a variety of MPFI
Fuel Rails in both stainless steel and composite material designs
to provide manufacturers with a choice of efficient packaging,
superior performance and durability, low cost, and aesthetics.
Delphi Multec MPFI Fuel Rails are sold in conjunction with Delphi
Multec® Fuel Injectors. Pressure damping options include:
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Undamped ("Tech 0") Fuel Rails in both stainless steel
and composite material designs that provide a low cost
option for applications without fuel distribution issues.
Internally Damped ("Tech 1") Fuel Rails, also available
in both stainless steel and composite material designs,
feature a stainless steel damper positioned inside the fuel
rail conduit directly over the injectors. The damper is
robust to thermal and flexible fuel environments.
Pulsations are dampened at the injector source.
Integrally Damped ("Tech 2") Fuel Rails are made of
stainless steel. The conduit walls act as the damping
surface to eliminate the internal damper.

Delphi Multec® Multi-Port Fuel Injection Fuel Rail
Assemblies are available in stainless steel (top)
and composite material designs (bottom).

Delphi MPFI Fuel Rails are supplied preassembled with Delphi Multec Fuel Injectors and a pressure regulator (if
applicable). They are leak tested for elimination of engine-level leak. They provide low gain and filtered pressure
regulation with a provision for reference manifold pressure to help provide consistent operation over the life of the
vehicle. A range of pressure regulation is available.
Delphi Stainless Steel MPFI Fuel Rails provide high resistance to impacts and prevent corrosion with all market
fuels. The stainless steel construction and use of a single O-ring at the injector interface contribute to reduced
evaporative emissions.
Delphi Composite Material MPFI Fuel Rails offer enhanced packaging flexibility because of advanced composite
molding technology. Their composite material construction also provides reduced heat transfer. Composite fuel
rails typically offer 50% lower cost and 50% lower mass than comparable steel fuel rails. No failures due to
composite material degradation have been experienced.

Benefits
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Delphi MPFI Fuel Rails are robust to ethanol fuel blends (0 to E100) and methanol fuel blends (including M15) for 15
years/150,000 miles, based on severe temperature and vibration test schedules.
Excellent warranty performance. Excellent first-time quality. Delphi has never experienced a fuel rail failure due to
material degradation.
Delphi's Internal Damping and Integral Damping designs minimize pulsations. (Low pressure pulsations.)

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