R320 crank no start no error code

JIA417

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2008 R320 CDI
Hi and thanks for all I have learned on this site already. I have read other posts about similar issues, and am now looking for advice on which way first.
Okay, so I have an 08 R320 CDI that has 126000 miles and will absolutely not start unless I give it a tiny amount of starting fluid (a bad thing). Once running, it runs fine. It started out being hard to start, and became progressively worse. At one time it threw p087 on just a generic obd2 reader, low fuel pressure, since I have changed the fuel filter and battery. I can hear the LPFP turn on when I turn the key over. Took it to a shop and they said it's either high pressure pump or injector, and I should sell it as is and move on. I have read instances where replacing the O rings on the fuel pump fixed the issue, but am considering taking the advice of the mechanic.
 
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JIA417

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Thank you both very much, I will do and report back.
 
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JIA417

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Okay, I am sure the process will be the same once I get the fuel line off, but getting to that point has more steps than his model. Mine has what I believe are a type of plastic compression clips. Also, is the fact that the far right is dirty a telling sign, or is that just due to being next to the oil fill cap? 15892379846111154299436561952857.jpg
 
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JIA417

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Okay, so after reinspecting and rereading I am still confused. The walk thru shows the plastic fitting going into the top of the injectors, where as the top of mine is the hard line from the fuel rail. The plastic fitting and rubber fuel line are next to itconnected to the fuel return. Either way, the 3/8" diameter tubing does not fit either one.
 

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mersum1es

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W212/-09/350CDI, W219/-07/320CDI, EX:W220/-01/320CDI, EX:W211/-04/320CDI, EX:W210/-01/270CDI
Yep, sorry that instruction is for inline engine with solenoid injectors, you probably have piezos and they may have slightly different sizes in lines (I didn't know that either). Piezos need return line pressure to work, now need to check out how that relates to leak back test... I have done leak test myself for solenoid engines only.
 


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