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I don't know the exact pressure of the low side,but you should have a continous flow of diesel through the filter to the high pressure pump as soon as you switch the ignition on.I work for a Peugeot specialist and we have changed an awful lot of low pressure pumps.The first thing we always do is unclip one of the pumps either to or from the filter and flick the ignition on.If no diesel comes out,then we know its a low pressure pump fault.What can happen is the low pressure pump begins to break up sending fillings through the filter to the high pressure pump.These pumps are amazing pieces of engineering and create massive pressures,even when just cranking the engine over,but they can are easily damaged by metal fillings running through them.
I guess you know not to mess about with the high pressure pipes?.The pressure is around 1800 bar when the system is running properly,so any leaks at that pressure bring with them the possibility that if your hands or fingers are anywhere near them then the diesel can penetrate your skin!.You are then in serious trouble!!!
If you have diesel being pumped from the tank to the high pressure pump,then you have to suspect the high pressure pump again.The Peugeots do have a unit on the back of the high pressure pump to regulate pressure and these can cause problems,but as a new pump is £700+ and the regulator is £250+ from Peugeot,we usually source a second hand pump which comes with the regulator fitted to it.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo
Last edited by Lagdti; 10th March 2007 at 09:22 PM.