Page 144 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Let’s understand about FIP, Injectors and fuel feed pump importance

Fuel feed pump
A low pressure feed pump ensures that the injection pump receives a continuous flow of filtered fuel. The fuel feed
operates only when the engine is running. Fuel is injected form the fuel feed pump directly into the intake pipe at
the point where it is mixed with the air.

The fuel feed pump plays a crucial role in delivering fuel from the tank to the engine at the correct pressure and
flow rate. It ensures proper combustion, engine performance and overall efficiency by maintaining a steady supply
of fuel to engine system. Without it, the engine might not receive enough fuel, leading to poor performance or
even failure.
The mainly purpose of fuel feed pump is to convey the required quantity of fuel form the tank to the engine at
the necessary pressure. A lift pump supplies low pressure fuel from the tank to the injection pump on the engine,
providing roughly 8 psi - 15 psi of pressure supply. The injection pump or injectors then pressurizes the fuel into
the cylinder at somewhere between 15000 psi – 30000 psi. It pressure is normal engine operation. Literally 30
psi – 50 psi range can be vary depending on the make and model of the vehicle.
FIP (Fuel Injection Pump)
Pump tests can also use to validate new pumps or repair. A pump could be machined imperfectly; the pump could
be mounted incorrectly or it could simply be the wrong impeller in the pump.
The fuel injection pump regulates the amount of fuel that is delivered to the engine order to regulate the engine
speed. When the engine is the running at higher speed, more is being injected into the cylinder. When the engine
is running at lower speed, less fuel is being injected into the cylinders.
Function of the diesel fuel injection pump test bench testing and calibrating the fuel supply amount of each
cylinder and fuel supply uniformity of mechanical injection pump. Testing the fuel supply spacing of each cylinder
and fuel supply starting point in the static state.

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CITS : Automotive - Mechanic Diesel - Lesson 31 - 38 CITS : Automotive - Mechanic Diesel - Lesson 31 - 38