Choose Your Fuel Pumps Help Topic Below
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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