Diesel Pressure Line

Modern diesel engines don't have a traditional injection pump, apparently, but a pressurised line. Can someone tell me how this works, what is the pressure and how is it maintained?

TIA.

Reply to
Alasdair
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On a traditional diesel the fuel pump pumps diesel to each injector via its own pipe, the pump is mechanically driven normally by the cam belt or chain. The pressure varies depending on engine speed. With common rail, there is a single pipe connected to all the injectors which is maintained at high pressure by an electric pump the engine management unit controls how much diesel to inject, which controls the burn and efficiency of the engine. These engines generally are more economical and quieter than the traditional diesel, but obviously more complicated.

Reply to
Sadcrab

The message from Alasdair contains these words:

There's a single very high pressure rail and fuel is allowed through from it via electronically controlled injectors. It's much more like petrol injection than traditional diesel injection. The pressure is around 1500 Bar and, not suprisingly, is maintained by a pump!

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Should give you an idea.

Reply to
Guy King

Common rail engines usualy have an engine driven pump still, the PSA DV4/6 has a cam belt driven pump, its even timed to the crank/cam as a conventional diesel pump is, I dont know why yet.

S
Reply to
smarshall

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