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The part number would be a massive helpHi there, are you after the part number ?
Yep , agreed , going by Grober's link , in which the item numbers agree with the OP's line drawing . There are different variants because some cars would have a single fuel pump and some had two pumps in series ( at least one of mine had a first fuel pump right under the tank , then a second pump in series within the pack ) . Also , some may have had twin pumps in parallel .I think the OP is right, 56 looks like the accumulator (with the right angled fitting), 23 is the filter in the middle and the fuel pump is 5. 128 and 125 and the nuts and washers for the electrical connection. Likewise you can see the check valve included in the parts kit #11 in the diagram.
Thanks Graeme, I’ve been phoning around various garages including official Mercedes dealerships in the hope to find a mechanic that knows their way around W123’s.Unlikely- your car is probably equiped with a Bosch K-jetronic mechanical injection system. The whole system is hydraulically powered by fuel pressure provided by that pump system we have been discussing--- the fuel supply volume/pressure must be adequate for the system to function correctly and a good start is to check the cars fuel delivery is adequate- this takes experience and a few basic measuring tools like a fuel pressure gauge.
K-Jetronic Troubleshooting - From a couple of specialists
www.benzworld.org
Much appreciate, unfortunately I can’t open the link for the w123 disc 1Here's a link to a description of the 2 fuel pump packages
you might find this interesting also
MBUSA ISP Portal
www.startekinfo.com
make sure you have adobe flash downloaded and enabled in your browserMuch appreciate, unfortunately I can’t open the link for the w123 disc 1
What I've had in the past with one of my W124s was that the electrical connector to one of the two fuel pumps had corroded , so I was running on only one pump ; the car would suffer fuel starvation under hard acceleration , and would only reach a certain speed ( can;t remember how fast now , it was years ago ) .Does anyone know if the failing accumulator have anything to do with lack of power on cold or warm driving?
At the moment with regards to power, it’s a toss up between my 280 Ce and a ride on mower
Thanks for the info, I’ve just been looking through the past bills and there is a March 2019 receipt from West Hampstead Motors LTD they drained out the tank and blew through with compressed air then renewed with petrol filter so hopefully the lines should be clearWhat I've had in the past with one of my W124s was that the electrical connector to one of the two fuel pumps had corroded , so I was running on only one pump ; the car would suffer fuel starvation under hard acceleration , and would only reach a certain speed ( can;t remember how fast now , it was years ago ) .
But worth checking the connections to the two pumps ( if you have them ) . Note : while there will only be one fuel pump in 'the package' if you follow the fuel feed hose back towards the tank , you will often find another fuel pump up above the rear suspension , beside the line coming out of the tank strainer .
Mentioning the tank strainer , these can give problems if they become choked with debris ( on diesel cars they can become clogged with a sort of algae that grows in diesel tanks , but in petrol cars it is usually just a mixture of dirt and rust that has accumulated over the years . The strainer is not an expensive item , but you need to drain the tank fully to replace it . You also need a very large socket ( can't now remember the size , but I got the new strainer first then went into Halfords with it and found it was the largest one they stocked !!!
A blocked fuel filter is another possibility , if it looks not to have been changed in a while .
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