I need to replace the 2 rubber hose fuel lines that connnect the injector rails to the LH inside fender well metal fuel lines. Each line is terminated with metal fittings that look to contain hose barb ends.

The hoses are marked 8X14. Is that an 8mm ID hose?

To accomplish the R&R, can I just cut the old rubber hoses away from the original fittings and replace with new rubber hose?

I am aware that the max pressure in these lines is about 50psi.

Appreciate the advise.

284 kmiles on the clock - still my daily driver 80mi/day

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

I'd have to see a pic of the ends, but many hoses of that type use crimp ferrules. ( A/C hoses are a good example ) . If so, cut / peal the ferrules to remove them then use regular hose clamps for replacement. Some ferrules also crimp to the steel line, don't cut there as the steel line might become damaged.

Fuel injection pressure rated hose is now common at auto parts stores. For all practical purposes, 8mm ID = 5 /16" ID so no need to source metric hose. 8 MM = 0.3149 5/16" = 0.3125"

Tom, recommend contacting the Parts Department at your local MB dealer for the hose assemblies. The last thing you want to happen is for some makeshift replacement to fail and spray gasoline in the engine compartment.

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Fred Hoelzle

There are no compressed metal crimp bands on the ends of the rubber hoses where they are installed on the fittings.

If any one has done this repair by re-using the metal fittings, I certainly would like to learn about their experience. Once I cut the hoses off, I am committed and the car is disabled until repaired.

BTW, I have made up many aircraft hydraulic and fuel lines - there is no magic.

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

Can you post a pic? Rubber hoses usually need some sort of crimping ring to hold them on. However, there are types of rubber hose that don't require clamps for sub 300 PSI when used with special barbs. Gates " Lock - On " or Dayco " Push Lock " I haven't seen this is an OE automotive fuel environment though.

Are you sure they are not nylon? 8 MM ID / 14 MM OD = 3 MM wall. Can you see the hose barb bumps through the surface? If so , these are installed using a tool that grabs the plastic line then pushes it on to the barb. Another method consists of slowly heating the nylon end with a heat gun then pushing on.

The thin type hoses I believe are the same type as MB uses for brake booster vacuum line, Its heated onto the barb. I have seen such hoses replaced on other cars with regular hydraulic type crimp hose. It would work unless the original hose setup has some quick disconnects like japanese cars use.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Attached is a picture of both of the fuel lines - wheel well inside fender ends. You can see the ripples rom the hose barbs. I did contact the local MB dealer today and just like me he could not clearly ID the PNs for the hoses. With a guess at the PNs, I was also told that there are only 4 in the entire country! Price for both quoted around $140.

Hope I can repair these babies!

Attached Thumbnails

 

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

Zulfigar

Thanks for the info on hose construction. With that encouragement, I cut off the hose from the fittings. First, the ID of the hose is indeed 8mm. The hose construction is an inner plastic (or nylon) tube covered with an overlay of rubber. The OD of the hose is 14mm. The plastic looks to be molded or heat-shrunk to the hose barb end of the fittings. There are no clamps used in the OEM hose.

I replaced the hose with a high-pressure fuel hose 5/16" ID. Fuel line appropriate hose clamps are used to secure the fittings to the hose.

Re-assembled - no leaks.

Since rubber fuel lines tend to relax at the clamping points, I will institute an inspection program to be sure the lines retain their integrity.

Repair cost $10! Time for a beer.

Once again, thanks Zulfigar

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

Tom, glad to hear you replaced the leaking fuel hoses. You may want to take a piece of the old hose to your local MB dealer to see if they stock that same hose, or can order it for you.

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Fred Hoelzle

When I contacted the MB dealer, I asked if they re-manufactured hoses or they just R&R. They were very up-front - only R&R, and recommended several places in the area that could fabricate hoses. So although I did not specifically ask if they stocked that particular hose, I suspect that they would not.

That makes sense, since at a shop rate of >$80-100/hr, it is less expensive for the dealer to R&R (and the customer too).

I know that I could never afford my MB if I did not do the maintenance myself. And this forum is a lifesaver to boot - I learned so much about my MB here. I smile at the words "dashectomy" from Saguni, and all that I learned from A. Dalton on codes and many others too.

So right now I am back in the MB saddle, enjoying the daily ride. Maybe I'll reach that magic milestone of 500 klicks (312kmiles)

Again, thanks to the forum!

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

you are most welcome.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)