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

Choose Your DannysEnginePortal.com Help Topic Below

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

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 fuel 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. 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. 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. 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.

Please Share DannysEnginePortal.com News