e320 turbo diesel fuel supply problems

[wilbyric]

Hi all Iam looking for a few solutions to my xmas bomb shell Ifound Ihad fuel line leaks run upto xmas so changed all plastic lines first problem was two bahind fan broke upon removal so not 100% sure if in correct location any suggestions as the correct position would be smashing!

 

[JOB-BLACK-RAT]

Hello and welcome to the forum, sure somebody on here will be able to help!

 

[renault12ts]

Welcome to the forum.

Small suggestion...if you take time when typing, we will take time replying.

 

[ringway]

Welcome Wil.

What year is your 320CDI?

 

[wilbyric]

HI all I will try to make this a bit more readable, my problem is with my 2002 model e320CDI

 

[ringway]

The fuel lines to the HP pump behind the fan are different lengths, so you'll have them in the correct position.

Maybe you haven't connected the pipes properly?

Did the leak start immediately after installing the fuel lines?

 

[wilbyric]

Hi
I found the leak before replacing the pipes, I was in transit from shopping when a diesel smell came into car through vents, I opened the bonnet with engine running to find diesel pumping all over the fan belt, from one of the pipes now replaced, I also replaced the fuel filter whilst all the pipes were off and topped it back up with fuel, along with the plastic pipes I also had to replace the pipes and fittings at the top of the ejectors as one had corroded maybe due to adverse temperatures, now do do not seem to be getting a supply all through the system ?
thanks wilbyric

 

[englishdas]

just out of interest, am i correct in assuming the old lines will have no 'give' in them after a decade, so at some point the diameter of the fittings that go inside the lines may be slightly smaller than the lines themselves, which at some point you are going to invariably connect up to, at some point.

could this be causing the leak? would it be possible to find a specific (rubber, maybe) washer that sits inside the grooves of the fittings?

i'm curious about this myself, as it's exactly the same job with exactly the same area of fuel line that i've got going on this afternoon. it's making me nervous.

Good luck Wilbyric, hope you find a cure

 

[ringway]

Hi
I found the leak before replacing the pipes, I was in transit from shopping when a diesel smell came into car through vents, I opened the bonnet with engine running to find diesel pumping all over the fan belt, from one of the pipes now replaced, I also replaced the fuel filter whilst all the pipes were off and topped it back up with fuel, along with the plastic pipes I also had to replace the pipes and fittings at the top of the ejectors as one had corroded maybe due to adverse temperatures, now do do not seem to be getting a supply all through the system ?
thanks wilbyric

Check the connection of the pipes at the ends. The white O-rings have to seat properly.

Also, it can be confusing as to where the leak is coming from because the fuel tends to drip from "off" the HP pump on to the belt, (even if the leak is from a fuel line) so don't rule out the leak coming from the pump itself.

 

[wilbyric]

HI I could not be sure of the hows and why's, all I know is the existing lines had hardened making them brittle, the new ones I purchased from dealers were flexible, is your engine between 2000-2002 model, I just need verification that the pipes are in correct port, at present the pipe from ejector rack the long pipe across top of the engine this is in the rh side and the lh is from the fuel filter I believe these cannot be wrongly fitted?
This job if you are going to take it on is a night mare as working area is very tight ,I would think my problem is getting supply of fuel to the ejectors?
Thanks wilbyric

 

[ringway]

just out of interest, am i correct in assuming the old lines will have no 'give' in them after a decade, so at some point the diameter of the fittings that go inside the lines may be slightly smaller than the lines themselves, which at some point you are going to invariably connect up to, at some point.

could this be causing the leak? would it be possible to find a specific (rubber, maybe) washer that sits inside the grooves of the fittings?

i'm curious about this myself, as it's exactly the same job with exactly the same area of fuel line that i've got going on this afternoon. it's making me nervous.

Good luck Wilbyric, hope you find a cure

The pipes have white O-rings at each end that are a snug fit when connected properly.

It's always a good idea to replace all three pipes at the same time, especially if installing a new HP pump.

 

[ringway]

HI I could not be sure of the hows and why's, all I know is the existing lines had hardened making them brittle, the new ones I purchased from dealers were flexible, is your engine between 2000-2002 model, I just need verification that the pipes are in correct port, at present the pipe from ejector rack the long pipe across top of the engine this is in the rh side and the lh is from the fuel filter I believe these cannot be wrongly fitted?
This job if you are going to take it on is a night mare as working area is very tight ,I would think my problem is getting supply of fuel to the ejectors?
Thanks wilbyric

All three pipes are different lengths, so can only be installed in the correct location.

 

[dog68]

Take a picture if you can, by rack, are you meaning common rail?

 

[wilbyric]

Hi Ringway thanks for your constant help, I look to have managed to get all the area's sealed no leaks evident, I have rechecked every thing, I have fuel supply to the the ejector rack but cannot seem to get a fuel supply to the ejector pipes, I have tried to turn engine over loosening each pipe to get rid of the air but still do not seem to be getting a good supply, is there a fuel shut off stopping this happening ?

 

[wilbyric]

HI dog68 I would think common rack and rail are probably the same, do you have any idea or suggestion to assist ? I will try to add some picture but I am a bit new at this.
thanks Wilbyric

 

[wilbyric]

HI all Ihave tried to attach pictures without success not sure if it is due to being new user ?
thanks wilbyric

 

[renault12ts]

How did you try?

 

[englishdas]

if it makes you feel any better Wil, I've just got to the same stage you are at, and seem to be having issues with the fuel making it past the low fuel pressure sensor line, i have about 4 inches of fuel line that won't 'charge'with diesel. I'm wondering, as i bet you are, if there's some 'air release' at the very top of the system to bleed the air off and let the fuel rail and lines fill up.

Confused.com...

Hope you're having better luck than me. by the way, yeah, how tight was it, behind the fan!

 

[tmaoahthfte]

I've just removed the fuel rail and all the plastic pipework on my 22o cdi to get to and replace the thermostat housing. After bolting everything back together it took three turns of the key before the engine fired up and that was without trying to bleed any air out of the system. Maybe there's air getting in downstream of the hp pump?

 

[englishdas]

Ringway, I took your advice on the white washers, took a look and the one I hadn't replaced (nearest the front of the engine) was hammered when re-tightening. Replaced it with (a washingmachine) washer, which is tight as a drum and should be fine til I get to MB Parts dept next time I drive by.

tmaoahthfte, I took solace in your last post and thought, forget manually re-charging the sytem, I'll persevere with trying to fire it up now that the old washer is replaced... and VROOM VROOM!

So good luck Wil, It's bound to start cos If I can get it running after Initially just wanting to change a thermostat, and that being the limit of my technical skill, you can do it my friend.