W123 280 CE Fuel Accumulator
- Thread starter Glasfryn
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grober
MB Master
FUEL PUMP PACKAGE MERCEDES 280 CE USA (123053)
Parts for unit FUEL PUMP PACKAGE MERCEDES 280 CE USA (123053)
www.ilcats.ru
Only thing thats puzzling are the 2 threaded connections when there's usually only one ?
best thing is to check your own setup to see the run of the existing pipework.
This is the usual setup but the EARLIER alternative would be fuel passing in and out of the accumulator after the fuel pump and then to the filter instead of the T junction at the fuel filter inlet
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T
The part number would be a massive help
grober
MB Master
Correction- looking at this diagram again with its associated parts list !! the fuel line order is tank- pump-filter-accumulator [in/out] - line to engine which accumulator you buy will depend on the plumbing
if you need the [in out] twin threaded connectors type accumulator 56 the part no is A0004760121 the later setup with the single inlet accumulator pictured above will work fine but will require replumbing the fuel lines
if you need the [in out] twin threaded connectors type accumulator 56 the part no is A0004760121 the later setup with the single inlet accumulator pictured above will work fine but will require replumbing the fuel lines
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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.
grober
MB Master
the accumulator is often referred to as the pressure tank.[fuel supply]
www.bestpartstore.co.uk
the small right angled pipe at the far end is a safety feature fuel return in the event of the accumulator internal diaphragm leaking /failing and does not feature normally in fuel flow path
A0004760121 OEM part number Pressure tank, Fuel supply
Pressure tank, Fuel supply with OE part number A0004760121 compatible with MERCEDES-BENZ. Affordable OEM car parts from popular automobile OEMs. Compare prices online now and save money.
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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 .
grober
MB Master
Because of the age of the car and availability/ substitution of parts over the years the fuel pump "package" may have been altered/updated over the years so before ordering parts its essential to inspect what's there now.
grober
MB Master
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.
www.benzworld.org
K-Jetronic Troubleshooting - From a couple of specialists
www.benzworld.org
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
Unfortunately they have retired with their feet up but I have managed to find someone with confidence in W123’s so hopefully after a few quid has been spent I can get to the route cause.
grober
MB Master
Here's a link to a description of the 2 fuel pump packages
you might find this interesting also
www.startekinfo.com
you might find this interesting also
MBUSA ISP Portal
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
grober
MB Master
make sure you have adobe flash downloaded and enabled in your browser
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 ) .
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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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 clear
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