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  #10  
Old 27-12-2018
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As stated new otherwise would say reconditioned ..the injectors are programmed to their specific cylinders
One thing troubles me is that theres so much pressure from the hp pump return doesnt make sense
Anybody got a diagram for the fuel line routing I was told by MB agent that the pipes are in the wrong way ive searched for a schematic layout of the pipes just to correct myself but nothing shows up

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Old 27-12-2018
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Can't help with a schematic, sorry.

The return line from the back of the fuel rail is the output from the regulating valve. The valve opens just enough that the rail pressure is at the set point and the excess fuel (output by the HP pump) returns to the LP side.

The injector leak (from the tops of the injectors) goes to the fuel return valve on top of the filter. The other line on this valve goes back to the tank. When the fuel is cold, the fuel return valve puts the leakage back into the filter, unless it senses air. If it senses air OR when the fuel is warm, it returns to the tank. This system does not seem to give problems often, but that valve can fail.

If you are seeing lots of fuel in the line from the regulating valve, it *hints* that the pump might be good. Check the regulating valve. It is a fairly common point of failure.

Last edited by JeanLuke; 27-12-2018 at 06:19 PM.
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Old 30-12-2018
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I found these so far

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Old 04-01-2019
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I went ahead and tested these new injectors did the leak off test nr5 injector has very little leak off nr 4 2 and 1 has the same amount but 3 is the highest..im not feeling well with the result as these are new

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Old 04-01-2019
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How long did you run the test for?
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Old 04-01-2019
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Quote:
Originally Posted by Meccano View Post
How long did you run the test for?
Did the test running the motor for 1 minute


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I went ahead and connected the compressor gauge to one of the injector lines so disconnected nr1 pipe and cranked the motor to see what pressure builds up my gauge has a max of 12bar reading (so it would be stupid i know as these rails have 300 -1600 bar) i cranked the motor for 10 seconds and the gauge only went up to 6bar and stayed there so ran it again for 10 seconds same story ..very very low pressure

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Old 04-01-2019
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Gallon of petrol needed and matches will be a good solution

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Old 05-01-2019
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Quote:
Originally Posted by bodgie View Post
Were the new injectors "new" or reconditioned?



If reconditioned, they could be faulty, a leakback test will give you an idea.



Also injector classification may create some issues, as well as a bad fuel pressure regulator.



Jason
The injector classification is done problem still persist

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