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Difficulty: MediumFuel and Air Intake Systems

In a modern port fuel-injected gasoline engine, what is the correct sequence that fuel follows as it travels from the vehicle's storage tank to entering the engine cylinder?

  1. 1Electric fuel pump draws liquid gasoline from the fuel tank
  2. 2Fuel filter removes abrasive sediment and particulate contaminants
  3. 3Fuel rail distributes pressurized fuel evenly across the engine bank
  4. 4Fuel injector sprays an atomized mist into the intake runner
  5. 5Intake valve opens to draw the air-fuel mixture into the combustion chamber

Answer

Electric fuel pump draws liquid gasoline from the fuel tank → Fuel filter removes abrasive sediment and particulate contaminants → Fuel rail distributes pressurized fuel evenly across the engine bank → Fuel injector sprays an atomized mist into the intake runner → Intake valve opens to draw the air-fuel mixture into the combustion chamber
In a standard port fuel injection (PFI) system, fuel flow begins when the in-tank electric pump pressurizes fuel out of the tank. The fuel passes through an inline filter along the chassis to remove contaminants, enters the engine-mounted fuel rail for manifold distribution, is atomized by individual fuel injectors into the intake runner ports, and finally enters the combustion chamber past the open intake valve during the intake stroke.

Step-by-Step Solution

1
Identify the origin point and initial pressurization of fuel in the fuel system
The electric fuel pump inside the tank draws fuel and forces it into the main supply line.
Liquid fuel requires hydraulic pressure to overcome line resistance and travel forward to the engine bay.
2
Determine the protective filtration stage before reaching precision metering hardware
The inline fuel filter catches dirt, rust, and particulate matter.
Filtration must occur before fuel reaches precision-machined injector nozzles to prevent blockages.
3
Locate the component that holds and manifolds fuel at the cylinder head
The fuel rail receives the pressurized, filtered fuel.
The fuel rail serves as a pressurized reservoir that supplies each individual injector with equal volume and pressure.
4
Trace fuel metering and atomization into the intake passage
The fuel injector opens to discharge an atomized spray into the intake port.
Electronic fuel injectors convert high-pressure liquid fuel into a fine spray immediately upstream of the cylinder.
5
Identify the final entry path into the engine's power-producing zone
The intake valve opens to allow the air-fuel charge into the combustion chamber.
The downward movement of the piston during the intake stroke draws the mixture past the opened intake valve into the cylinder.

Key Concept

Port Fuel Injection Delivery Routing and Component Operation
Estimated Time:1m 0s
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Topics

Fuel and Air Intake Systems

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