Low Pressure Fuel Line Leak

[Breeeen]

Hey Guys,

I was beginning to process of doing a seal change on the high pressure pump as I had identified a leak, however once I took a few things off and gave the area a clean it looks like the leak is coming from one of the fuel lines.

I have taken a photo and circled where it is leaking (picture was taken before giving the area a clean down).



A couple of questions
- Is it more likely it is simply one of the washers/o-rings that is toast?

- I have these orings from Merc 6019970645 based on the 2.7 Everything page which are the green orings, however the ones on their are white and look more like this:



- I have taken the bracket off which is holding the lines on, whats the best method for removing the lines themselves, just pry them off gently?

Thanks again!

[JeanLuke]

To get them off, wiggle and pull. If you pry you risk breaking something.

It's the o-ring for sure. The washer isn't a seal. It's a spacer.

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[Adrian D]

Holy moly, Amazon is expensive....
Just drop by your local MB dealership if you have one in your area and order some there

[JeanLuke]

Pulling and wiggling is it, once you have the retaining plate off. Nothing else holds them except friction. I did mine some years ago, but I seem to remember carefully prying with a small screwdriver at the white washer.

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[Breeeen]

Got them off! Had to carefully use a flathead screw driver but they came off with some careful wiggling and light prying. O-rings replaced, now just need to bleed the fuel line.

Thanks for the help guys

[bodgie]

There may actually be a leak form the high pressure side of the pump too, and it's a common problem and a reasonably easy fix.

When you start it just keep an eye on fuel squirting out under pressure from one of the 3 caps on the pump.

Jason

[lekie]

The issue is I have fuel leaking around the fuel filter.
This all started after I had No 1 fuel injector replaced. Normally you would be straight back to your mechanic but for me there are logistics involved (distance and lack of vehicle) so I investigated.

Numerous hose clamps around rubber fuels lines were leaking. I would assume my diesel service people would have disconnected much of this. After several tightening episodes I thought I had solved the problem but there was still fuel dripping off the bell housing.

Now, I can see a hose running off a connection at or near the fuel rail at No5 cylinder (hard to see behind EGR) this hose passes back over the fuel filter and connects to a pipe running down behind the fire wall. What is this connection? Could this be the leak.

I need to add some more information. When I wanted to change my fuel filter (from poly 4x4) I decided to go to a one man diesel shop which was more handy than my diesel service centre. Fun and games – we discovered that the o rings were missing from the box the new filter came in – rang Poly on the spot and they dispatched a replacement straight away. Left the car with the mechanic, I was not in a hurry, but he decided to replace the filter with a different set up (claimed unnecessary) that bypassed one of the connections ( a T peace?).

It looks like the line running off/near the fuel rail is what was by passed.

Can any one give me more guidance on this?
Thanks