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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.
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