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Thread: G320 (M104 motor) Fuel Hose Replacement

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    G320 (M104 motor) Fuel Hose Replacement

    Recently, one of the fuel lines on my 1995 G320 sprung a leak, necessitating its replacement. For that matter, necessitating the replacement of ALL of the fuel hoses. As far as I can tell, all lines are original.

    (all photos and illustrations in this thread are from Mike C. of the PointedThree forum)

    Below is the EPC diagram of the G320 and G36 AMG fuel line system, as provided by Mike C., a friendly & knowledgable Pointed-Three G-wagen owner:

    w463fuel.jpeg

    Note that the fuel flows from fuel tank to fuel pump, then to the fuel filter, then to the engine, in that order.

    To start off, I ordered from MB four fuel lines:

    463 470 00 75 -- feed line that goes from the fuel tank to the fuel pump inlet

    463 470 01 75 -- line from outlet of fuel filter to hard line under truck that feeds engine

    463 470 02 75 -- second line that goes from fuel pump to fuel filter inlet (banjo fitting on fuel filter end)

    463 470 03 75 -- first line that connects directly from fuel pump outlet to fuel filter

    What I found is that:

    • the 00 75 line is NLA from MB, and will never be available again
    • the 01 75 line is currently backordered from MB, with no availability date projected
    • the 02 75 and 03 75 lines are available from MB, and I received them

    The line that sprung the leak was the line that leads from the fuel filter OUTLET to the hard line that goes under the truck to supply the engine -- 463 470 01 75. This line has an ordinary "screw" fitting on one end, and a curved "U-shaped" metal end that screws onto the fuel filter outlet.

    What I found was at the 03 75 hose is exactly the same length as the 01 75 hose, and ships from the factory with the screw fitting already crimped onto one end (see image below) with nothing on the other end.

    I removed the leaky 01 75 hose from my G-wagen, and brought both it and the new 03 75 hose to a local company that does fuel and hydraulic hoses. They agreed to either re-use the metal "U-shaped" fitting from my existing 01 75 hose and crimp it onto the new 03 75 hose, or they would create a new U-shaped metal fitting if needed and crimp it on the new hose.

    Here are a couple of views of the back-ordered 01 75 hose (with the U-shaped metal fitting) on the truck, mounted to the fuel filter on the right side of the photo. The hose on the left side is the 02 75 hose, which has the banjo fitting on it as mentioned, connecting to the fuel filter inlet.

    IMG_1246.jpg IMG_6995.jpg

    As part of this project, I aim to replace all of the fuel lines both in the rear of the truck, as well as those underhood. Thus, as part of this project, I will be doing the following:

    • re-ordering ANOTHER 03 75 hose, to replace the new one I bought as the donor for the back-ordered 01 75 hose
    • replacing the 02 75 hose (with the banjo end) that goes into the fuel filter
    • manufacturing or substituting a hose for the 00 75 hose that goes from tank to fuel pump
    • replacing another hose under the truck, 463 476 14 26, which is a short hose in the feed line from the fuel filter to the engine feed. Fortunately this hose is still available from MB, though it is also easily substitutable from other car models and chassis
    • replacing both the supply and return lines under the hood, which go from the hard lines under the truck to/from the M104 fuel rail & fuel cooler. These hoses are part numbers 463 470 07 75 and 463 4670 10 75 (both return lines), and feed line 463 476 14 26. Also 461 476 02 26, which runs from the fuel return hard line under the truck to the fuel tank
    • Replace the fuel filter (which I already have in hand)


    Doing some research, it also appears that there is a 280GE (M110, CIS) fuel hose that could potentially substitute for the back-ordered 463 470 01 75 hose. Its metal "U" fitting is more of an "L" shape, but it appears that it could work. I plan to order one of these to see if it will work correctly as a substitute.

    All for now -- I'll report more back as I learn it, and will do a fuel hose replacement HOW-TO once that operation commences.

    Cheers,
    Gerry

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Quote Originally Posted by gerryvz View Post
    Recently, one of the fuel lines on my 1995 G320 sprung a leak, necessitating its replacement.

    What I found is that:

    • the 00 75 line is NLA from MB, and will never be available again
    • the 01 75 line is currently backordered from MB, with no availability date projected
    • the 02 75 and 03 75 lines are available from MB, and I received them
    What is with MB refusing to produce mission-critical parts? There have to be a zillion G's on the road that use these hoses.

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
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    Re: G320 (M104 motor) Fuel Hose Replacement

    I have not cross-referenced with other models, but I think some of these hoses may be specific to the M104-based G. I need to do the cross-ref.

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    Re: G320 (M104 motor) Fuel Hose Replacement

    A few more images of the hoses in question:

    463 470 00 75 (NLA from MB) -- fuel tank to fuel pump
    b0c3352s-960.jpg e143352s-960.jpg 3183352s-960.jpg d8dd352s-960.jpg 855d352s-960.jpg


    463 470 01 75 (supposedly on back-order from MB) -- fuel filter outlet to feed line
    sunrise-trading_mb-a4634700175.jpg sunrise-trading_mb-a4634700175_2.jpg sunrise-trading_mb-a4634700175_3.jpg


    463 470 02 75 (available; in my possession) -- fuel pump outlet to fuel filter inlet
    image1 copy.jpg image2 copy.jpg


    463 470 03 75 (available from MB; being made into a 01 75 hose) -- fuel filter outlet to feed line
    sunrise-trading_mb-a4634700375.jpg sunrise-trading_mb-a4634700375_3.jpg


    463 476 14 26 (available from MB) -- fuel feed line to MB fuel cooler
    sunrise-trading_mb-a4634761426.jpg sunrise-trading_mb-a4634761426_2.jpg sunrise-trading_mb-a4634761426_4.jpg

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Quote Originally Posted by gerryvz View Post
    I have not cross-referenced with other models, but I think some of these hoses may be specific to the M104-based G. I need to do the cross-ref.
    May have to remove the shield and use
    Bulk hose on the barbs.
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

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    Re: G320 (M104 motor) Fuel Hose Replacement

    It wonít be particularly difficult to get proper hoses made, or to substitute hoses from other models if needed.

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Together, Mike and I have been able to come up with some alternatives to the NLA hoses, so I've put in an order for a few hoses.

    For the back-ordered 0175 hose, which has the "u-shaped" metal fitting that goes from the fuel filter outlet to the fuel feed hard line under the truck, we found the following hose, 124 470 80 75. This is made by both MB and Cohline (the OEM for MB), and it's about 15% the price as a Cohline-branded hose than the MB line is. This 124 470 80 75 hose looks like this:

    s-l500 (1).jpg


    Another hose, which goes from the end of the hard feed line to the engine on the engine (front) side of the truck, 463 470 14 26, appears that it can be also substituted with 116 470 27 75. This line is shown below:

    Hose2775.jpg


    I also ordered the following line, which also looks like it can be used as a possible substitute for the 0175 (back-ordered) fuel line. This is a 126 line that goes to the fuel cooler on the 560SEL/SEC etc.

    31191550jv.jpg


    Still a number of hoses that need replacing, and several of them (particularly ones underhood) are looking like they are NLA from MB.

    I did two-day shipping on my order so that I can get the truck back up and running. I know y'all are waiting for the inevitable HOW-TO.....

    Cheers,
    Gerry

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    Re: G320 (M104 motor) Fuel Hose Replacement

    FWIW, I had a local hydraulic supply make me new fuel and self-levelling lines by re-using then ends. Update the fuel-lines to a more ethanol-friendly line with more reinforcements for longer durability. It was very inexpensive.

    neil

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Gerry, the 124-470-80-75 hose is unlikely to have Cohline rubber. Aftermarket OEM went NLA a few years ago... unless they've come back into production? Last "OEM" hose I got a few years ago was Trucktec, with the Trucktec logo covered in black magic marker.

    Details & photos are at this thread:
    https://www.500eboard.com/forums/sho...l=1#post118783

    If you order Cohline and get a real Cohline hose, please post photos!! I find it suspicious that FCP does not list any country of origin for the Cohline hose, and also does not list it as 'OEM' either...
    https://www.fcpeuro.com/products/mer...ine-1244708075

    Since this hose can cause a car-b-que if it fails, I've been shelling out the outrageous price for OE.

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
    Click here for my YouTube channel

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    G320 (M104 motor) Fuel Hose Replacement

    Iíll let you know what I get. If itís crap, I wonít use it. Mainly I care about fit, as a backup/alternative to the one Iím having made.

    If it fits, then I will likely order one as a spare.

    If itís Trucktek, Iíll use the one Iím having made/refurbished. And Iíll throw it as far as I can ó maybe it will land in ntrepidís or 8899ís yard.

    One sniff should tell me for sure.

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    Re: G320 (M104 motor) Fuel Hose Replacement



    Today I received the new hose from the local hose shop. They decided to create a new metal fitting for the fuel filter outlet end of the hose, rather than trying to re-use the old fitting. They did create, bend and crimp the new fitting onto the end of the MB hose 463 470 03 75, so I will need to re-order a new hose for that application.

    The cost of the "new" hose was $48 including tax -- not super cheap.

    Here are some views of the old (leaking) hose and the new fitting. You can see the cracks in the bend in the old hose -- these are where the gasoline mist was spraying out of against the frame of the truck. The molded angle-bend in the new hose will straighten itself out once it is mounted. I plan to fit the new hose and replacement fuel filter tonight onto the truck.

    You can see the poor condition of the old fuel line. The truck has less than 130,000 miles on it, so this is largely caused by the age of the rubber, not necessarily use. If you have not replaced the fuel lines in your E500E, remember that these lines are actually one year NEWER than the newest E500 out there, the truck being a 1995 model.

    REPLACE YOUR FUEL LINES......

    IMG_8083.JPG IMG_8084.JPG IMG_8085.JPG IMG_8086.JPG IMG_8087.JPG

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Installed the new hose without replacing the fuel filter. All matched up nicely and was able to drive the G for the first time in about a month tonight. I'll tackle the fuel filter and line replacement tomorrow or perhaps Saturday morning before we head over to tailgate at the Navy football game....

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    Re: G320 (M104 motor) Fuel Hose Replacement

    Quote Originally Posted by gsxr View Post
    Gerry, the 124-470-80-75 hose is unlikely to have Cohline rubber. Aftermarket OEM went NLA a few years ago... unless they've come back into production? Last "OEM" hose I got a few years ago was Trucktec, with the Trucktec logo covered in black magic marker.

    Details & photos are at this thread:
    https://www.500eboard.com/forums/sho...l=1#post118783

    If you order Cohline and get a real Cohline hose, please post photos!! I find it suspicious that FCP does not list any country of origin for the Cohline hose, and also does not list it as 'OEM' either...
    https://www.fcpeuro.com/products/mer...ine-1244708075

    Since this hose can cause a car-b-que if it fails, I've been shelling out the outrageous price for OE.

    Dave,

    I received the hose today, 124 470 80 75. It is, indeed, a Cohline hose that was made in Germany. I've attached photos for proof. I recommend, since this is a part that all E500E owners need, that they should get this part as soon as possible in case it goes out of stock again. I purchased this hose from AutohauZ, FYI, not FCP.

    For my G320 application, it appears that this hose is about a foot too long, but it will certainly still work in this application. Since I have the hose that the local company made already in hand and installed on the truck, I think I'll use this Cohline hose for the E500.

    Cheers,
    Gerry
    Attached Images Attached Images

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