Distributor Pipe - Volkswagen 1.9-Liter TDI Owner's Manual

Distributor Pipe

A distributor pipe is integrated in the fuel
supply line in the cylinder head. It distributes
the fuel evenly to the pump/injectors at a
uniform temperature.
Cylinder 1
In the supply line, the fuel moves through
the center of the distributor pipe toward
cylinder 1 at the far end.
The fuel also moves through the cross
holes in the distributor pipe and enters the
annular gap between the distributor pipe
and the cylinder head wall.
This fuel mixes with the hot unused fuel
that has been forced back into the supply
line by the pump/injectors.
This results in a uniform temperature
of the fuel in the supply line running to
all cylinders.
All pump/injectors are supplied with
the same fuel mass, and the engine
runs smoothly.
Cylinder 2
Annular Gap
Cylinder 3
Cross Holes
Fuel from
Pump/Injector
Mixing Fuel in
Annular Gap
Cross Holes
Fuel Supply
SSP209/040
Cylinder 4
Cylinder Head
Distributor Pipe
SSP209/039
Fuel to Pump/Injector
SSP209/29
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