Fuel Pumps - Deliver Fuel From The Fuel Tank To The Engine
Fuel Pumps – Deliver Fuel From The Fuel Tank To The Engine

Choose Your Fuel Pumps Help Topic Below

Fuel Pump Failure – Warning Signs – Common Causes – Failure Symptoms

Common Fuel Pump Issues – Excessive Heat – Contamination From Dirt and Rust

Fuel Pump Related No Start Problems – What Should You Check

Electric Fuel Pumps – How Do They Work – How Can They Fail

Fuel System Related Problems – Not Always Easy To Solve

Hard Starting Engine – Cold, Hot, Both Or Just After Refueling

Engine Fuel System Testing – Proper Testing With Solutions

Mechanical Fuel Pumps – Basic Information And Troubleshooting

Fuel Pump Diagnosis Tips from Carter (PDF file – requires Adobe Acrobat Reader to view).


Fuel Pumps – Deliver Fuel From The Fuel Tank To The Engine

So, There are basically two types of pumps:

  • Electric Fuel Pumps
  • Mechanical Fuel Pumps

How Does The Electric Fuel Pump Work

When the driver turns the ignition key on; the (PCM) energizes a relay that supplies voltage to the fuel pump. As a result, The motor inside the pump starts to spin; and runs for a few seconds to build pressure. A timer in the (PCM) limits how long the pump will run until the engine starts. Finally, Fuel is drawn into the pump; through an inlet tube and mesh filter sock. The fuel then exits the pump through a one-way check valve.

A fuel filter traps any rust; dirt or other solid contaminants; that may have passed through the pump. As a result, preventing such particles from clogging the fuel injectors.

The fuel then flows to the fuel supply rail on the engine; and is routed to the individual fuel injectors. Consequently, A fuel pressure regulator on the fuel rail maintains fuel pressure; and routes excess fuel back to the tank. But, On newer vehicles with returnless (EFI) systems; the fuel pressure regulator is located in the fuel tank. Consequently, it is part of the fuel pump module. As a result, There is no fuel return line from the engine back to the tank.

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