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  #1  
Old 09-07-2018, 10:45 PM
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what size is this fuel hose on 87 560SL

It's located near drivers rear wheel on 87 560SL. It is about 8" long held on with 2 hose clamps. It's the curved one, wet on the bottom.

I need to buy a replacement hose. What size is the hose? Is hose pressurized with engine off. I want to minimize fuel spill and avoid getting drenched with gasoline. Thanks!
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what size is this fuel hose on 87 560SL-20180831_110001-979x1305.jpg  
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Old 09-08-2018, 09:37 AM
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I don't have an answer for you, but since it's attached to the hard fuel line, can you measure the hard line with a caliper?
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  #3  
Old 09-08-2018, 10:28 AM
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Quote:
Originally Posted by Diseasel300 View Post
I don't have an answer for you, but since it's attached to the hard fuel line, can you measure the hard line with a caliper?
I didn't have my tools with me when I hurriedly snapped the pic. I should have taken a piece of paper, tore out a slot that matches the diameter of the hard fuel line then measure the paper later. I was in a hurry and didn't think of doing that.

The car is 1/2 hour away (sister's car). I want to have parts and tools ready before going there to do the job.
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Old 09-08-2018, 10:50 AM
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Forum member Graham sent me this parts diagram link https://www.sls-hh-shop.de/main/de/mercedes-280-560sl-w107/47-tank-und-benzinpumpe/47-c-kraftstoff-versorgung-ab-09-1985

Assumption: If item 63 is the same valve as in my pic, then the leaky hose in its vicinity is item 66, p/n A1244762726 (Shaped hose to vent).

Someone with knowledge please confirm or deny my assumption. What size is that hose? I don't want to buy it from Mercedes, I want to buy a replacement hose from an auto parts store.
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Old 09-08-2018, 11:46 AM
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If it is the main fuel supply line 82, it should have threaded end connections like this:



Perhaps someone cut fittings off and used hose clamps? Maybe reason for leaks?

If it is 40, then site says it is only 5.5mm (looks bigger than that)

Line 81 is fuel return to tank and leads to elbow 92 and it is 7.5mm ID/13mm OD.

Still waiting for some who knows car to help
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Old 09-08-2018, 12:07 PM
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Quote:
Originally Posted by Graham View Post
If it is the main fuel supply line 82, it should have threaded end connections like this:



Perhaps someone cut fittings off and used hose clamps? Maybe reason for leaks?

If it is 40, then site says it is only 5.5mm (looks bigger than that)

Line 81 is fuel return to tank and leads to elbow 92 and it is 7.5mm ID/13mm OD.

Still waiting for some who knows car to help
It is definitely not the supply hose with threaded ends, which I replaced about a year ago (it was also leaking and was on the passenger rear). The hose in question is on the driver's side rear.
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Old 09-08-2018, 03:36 PM
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After checking a few other diagrams and knowing the line is on driver side, I started to think it was item 92 in diagram. Rowdie (who sometimes posts here and has a late model 107) also thinks it is that return line.

The hose it seems is 7.5mm ID x 13.5mm OD. It is clamped to the metal return line.

You will have to completely drain tank to remove that hose. If part at tank is still good, it could perhaps be clamped closed, cut off and a short piece of tubing used as joiner to a new hose?
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Old 09-08-2018, 09:12 PM
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A very common size is 8mm / 5/16"

I don't know this car specifically, but on a EFI car, MB generally uses a 5/8" ish hose from the tank to electric fuel pump then smaller line from there. Pinching off the 5/8" line should work.

You are still going to get some fuel leakage when the hose is removed.
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  #9  
Old 09-08-2018, 09:58 PM
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Quote:
Originally Posted by 97 SL320 View Post
A very common size is 8mm / 5/16"

I don't know this car specifically, but on a EFI car, MB generally uses a 5/8" ish hose from the tank to electric fuel pump then smaller line from there. Pinching off the 5/8" line should work.

You are still going to get some fuel leakage when the hose is removed.
MB uses metric sizes - including 107s .

Fuel and vent hose is sometimes 7.5mm ID. But you can't guess these things, because they vary according to MY

Type of rubber used also varies depending on the fluid handled. Many changed over the years because of ethanol in fuel as well as because of need to reduce permeation.

Hoses from tank to pump varies in size on 107 depending on MY - Not relevant to this discussion, but I think it is 14mm ID for 560SL. Pinching the line from the tank won't stop Funola from getting a deluge from tank if he removes the fuel return line.
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Last edited by Graham; 09-09-2018 at 09:48 AM.
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Old 09-09-2018, 12:01 PM
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I am still uncertain what that wet hose is in my 1st post above. Hose in question is near the driver's side rear wheel and is next to what looks like a check valve. If that valve is item 63 (which goes to the charcoal filter), then the hose in question (next to the valve) would be item 66, a vent hose.

Are items 63 & 66 part of the fuel vapor evap control system? If so, it should have gasoline fumes and not fuel running through it? Is that right?
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  #11  
Old 09-09-2018, 12:53 PM
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I'm looking at the EPC diagram. That is the fuel return line. Part number 230 476 87 26 fuel hose sold by the meter. Size is what Graham stated.
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Old 09-09-2018, 12:56 PM
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THanks rowdie. Can someone post a fuel system diagram for 87 560SL?
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  #13  
Old 09-09-2018, 01:05 PM
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This online version of the EPC is not as complete as the subscription version but you will find the fuel system diagrams. https://nemigaparts.com/cat_spares/epc/mercedes/1/107/
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  #14  
Old 09-09-2018, 03:55 PM
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Quote:
Originally Posted by rowdie View Post
This online version of the EPC is not as complete as the subscription version but you will find the fuel system diagrams. https://nemigaparts.com/cat_spares/epc/mercedes/1/107/
Thanks, does the line associated with item 11 https://nemigaparts.com/cat_spares/epc/mercedes/1/fg/107048/575/47/060/ have fuel or vapor running through it? I have not owned a gasoline vehicle for 30 years so I'm a little rusty on gasser fuel system. I am looking for a connection where I can hook up a vacuum pump to create a vacuum in the tank so as not to spill any fuel when I r&r the leaky return hose. I have done that r&r a leaky return hose on my 85 300D without spilling a drop of fuel w/o draining the tank. I understand the risk involved and will take all necessary precautions so don't worry.
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  #15  
Old 09-09-2018, 05:11 PM
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Quote:
Originally Posted by funola View Post
Thanks, does the line associated with item 11 https://nemigaparts.com/cat_spares/epc/mercedes/1/fg/107048/575/47/060/ have fuel or vapor running through it? I have not owned a gasoline vehicle for 30 years so I'm a little rusty on gasser fuel system. I am looking for a connection where I can hook up a vacuum pump to create a vacuum in the tank so as not to spill any fuel when I r&r the leaky return hose. I have done that r&r a leaky return hose on my 85 300D without spilling a drop of fuel w/o draining the tank. I understand the risk involved and will take all necessary precautions so don't worry.
That's a vapor line. There are others too and an expansion tank. https://nemigaparts.com/cat_spares/epc/mercedes/1/fg/107048/575/47/015/

My feeling is that it will be easier to clamp the fuel exit hose from tank, disconnect it at bottom then run the fuel into a low level gas tank (I used an outboard motor tank). This after first siphoning most of fuel out of tank. It's not a big deal to do really.

If you do it with vacuum don't apply too much! Don't want to collapse the tanks. Couple of inches Hg at most. Should be enough for a not too full tank. If you plug or clamp one end of your new hose, you may be able to pull old one off and slip new one on without spilling much. Good luck if you try that
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Last edited by Graham; 09-09-2018 at 07:38 PM.
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