Fuel supply scheme. 1.9 TDI PD from VAG Group. Family of diesel engines with injection pump-injector

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10/05/2022
Fuel supply scheme. 1.9 TDI PD from VAG Group. Family of diesel engines with injection pump-injector

Fuel supply scheme:

 

h1.

 

h2.

 

Fuel pump

 

The fuel pump is located directly behind the vacuum pump on the cylinder head. It moves fuel from the fuel tank to the injector pump. Both pumps move together to the camshaft. They are also called tandem pumps.

 

 

 

The fuel pump is a blocking vane pump. The locking vanes are pressed against the pump rotor by spring pressure. This design allows the fuel pump to deliver fuel evenly at low engine speeds.

The fuel duct system inside the pump is designed so that the rotor always remains wet with fuel, even if the tank is dry.

 

 

Functions

There are 4 chambers in total: 2 draw in and 2 pump out fuel. The fuel pump runs by storing beer in the chambers. The volume of the chambers first increases and then decreases. This, in turn, pushes the fuel out of the pressure. Retraction and pumping chambers are separated from each other by spring locking blades and pump rotor blades. The fuel drawn into the chamber 1 is expelled from the chamber 2. The fuel drawn into the chamber 3 is pushed out of the chamber 4. The rotation of the rotor increases the volume of the chamber 1 and the volume of the chamber 4 decreases simultaneously. The fuel is pushed out of the chamber 4 to the fuel supply line to the cylinder head.

 

 

Rotation of the rotor increases the volume of the chamber 3 and reduces the volume of the chamber 2. The fuel drawn into the chamber 1 is pushed out of the chamber 2 to the fuel supply line in the cylinder head.

 

 

Read more about the family of diesel engines with injection pump-injector here .