W124 - Old Noisy Fuel Pumps Replaced

WOW, what a difference! Unfortunately I had places to be and things to do and did not have time to show the complete process. It is however, not rocket science. Don't forget the 2 new crush washers required per pump like I did! They do not come with the pumps.

[@MMWA-DAVE]

Since making this video, both new genuine Bosch pumps failed by way of gushing fuel out of the crimped end of the housing (o ring seal failure) both failed within 1 week of each other. They have been replaced again with genuine Bosch at the 6 years 5000KM mark. Not impressed.

[@rayhennig]

I think I read that before I paid 180€ each for Pierburg pumps. 2+ times the price of the Bosch pumps. The 2 Bosch pumps I have in stock are made in the Czech Republic. Where were yours made? Do you think you (and me??) were victim of bogus parts?

[@mickgriffin3335]

My 1993 W124 220E Suffered from a pump failure without any warning when i turned the key to start it, i thought at first that the modules had failed so changed them but still nothing, no priming noise at all, luckily i was in my drive so blessings counted there, this video helped a lot thank you, although my 220E has only a single pump i replaced it with a 6 bar pump and have not had any issues with it, once under the car it is a very simple job to do, thank you again for the video.

[@aboodmki3]

Mick Griffin Hello mate I have the same vehicle as yours W124.022 and mine also failed, there were no symptoms as you said but mine fried at me while i was driving, thankfully i managed to steer it and park it somewhere safe but it’s far away from my home, do i need jack stands for the job? because I’m not carrying any, can I perform the job with the car jack only?

[@tbos.]

@@aboodmki3 It's suicidal to use hydraulic jacks only, talkless of emergency jacks. Safety first, always us jack stands.

[@aboodmki3]

T BOS Suicidal 😂 Thanks

[@miketatai2328]

Hi I have 89 300e sedan , I clean the tank and the tank filter , filter it wasn’t bad , changed both fuel pump for OEM Bosch, Bosch filter , and accumulator, the car changed , I got the power😊 , fantastic to drive, thanks Mate I learned a lot from u , all best from Brisbane

[@MMWA-DAVE]

good to hear, sometimes it can be a long drawn out nightmare getting to the bottom of ke-jetronic issues

[@mrpeace7]

Nice jop my friend 👍 I think in service manual they said you need to replace fuel filter when you change a new fuel pump .

[@MMWA-DAVE]

Sounds like a good idea, I have changed mine only a few thousand kilometers ago though.

[@raym7441]

This is true only of the filter is past it's service life. There's no need to change it if it's not close to the end of it's service life. Or if you find low fuel pressure then it should be checked and serviced if needed.

[@mohamedamer8833]

I replaced mine with a Taiwanese one,still there is noise,but way lower than the old one. thanks for sharing

[@MMWA-DAVE]

any updates on your aftermarket pump? The genuine bosch’s failed at 6 years / 5000KM

[@mohamedamer8833]

Alive and kicking, same service level👍👍

[@mohamedamer8833]

@@MMWA-DAVE Still alive and kicking, with same service level. There are many question marks about German quality these days, their reputation is on the stake!

[@kiskiller3]

Are those two pumps the same part ?

[@runelarsen5769]

Very nice video. Did you demage the fuel hose when you clamp it? My Baby-Benz is 31 years.

[@osbornebay944]

Good job. quiet.

[@rfbu]

I recall you replaced a number of parts: injectors, regulator, accumulator, filter and pump. please report back regarding your starting - is it 'clean' during hot and cold starts?

[@MMWA-DAVE]

I've noticed my idle speed is a bit lower since doing this and there is occasional hesitation off idle like there is a huge vacuum leak - i suspect before I was running with a failed secondary pump and calibrated everything, including the new airflow meter at the time to the wrong low fuel pressure. I will check this out at a later date.

[@hannan52]

did you manage to get it done?vaccum leaks? hmmm..

[@marcox4358]

interesting to know that there's a plastic cover beneath the fuel pump, guess my car has quite a few parts missing...

[@dwoolaver1549]

Not all cars are set up like this one alot of cars trucks have fuel pump inside the gas tank

[@xhulianomurati5154]

Hahahaha same to mine

[@Scribe3168]

It sounds to me like your car has been race tuned and any unnecessary parts removed.

[@marcox4358]

@@Scribe3168 it has gone to hell and back. Altho it might need a new head gasket because it's leaking water

[@Scribe3168]

@@marcox4358 I have a 300TE which is now not firing on 1 maybe 2 cylinders. I’m just throwing parts at it (the cheaper ones) and so far no improvement. I’m just scouring the internet for potential cures. Good luck!

[@pricelessclips]

my 1993 300TE has 2 fuel pump. The one at the rear next to the fuel tank has a hose that is a "input line"coming from the fuel tank. Do you know information about that hose? I need to replace that. Thanks

[@matthapaq9618]

Hi Dave great videos as usual 🫡, Mate my E280/94 has two pumps, are they same as on 190e as I have three pumps two new one used as spares ,if I replaced them on the e280 with do the job or need to have the same pump as old ones? Cheers Matt

[@MMWA-DAVE]

i’m not aware of the hfm injection cars having the same fuel pumps as KE-jet but could be wrong. I would be getting the correct ones for your car based on the VIN.

[@matthapaq9618]

@@MMWA-DAVE Thank you Dave for your quick reply 🫡, yes I understand u that’s what I will do always, but because I already has 2 pups from the 190e I still need to check if there is any matches from both car pumps , must take out from E280 have look if the numbers on on the pumps close or same but it won’t as far as I think , I’ll try to to install them ☺️ and I’ll let you know what happens, Many thanks , thank youuuuuu again Have a wonderful weekend Cheers Matt

[@towcars5550]

I need help on a questiom

[@finnsamprod]

I have a 260e (300e in the US) My car will stall when it revs up too high (around 4-5k) then will completely die when i stop. When I go to start it again sometimes it just cranks over and wont start. If I leave the car for a few hours it will start up and run fine until it stalls and died again. Could it be my fuel pump? I have noticed it is very loud and and when the car stops and wont start again, the fuel pump will whine really loud when I prime the car.

[@MMWA-DAVE]

Finn sam sounds like you are on the right track. Make sure to change the filter at the same time and if feeling adventurous I would change the tank screen filter too. There is also another screen on one of the fuel distributor fuel connections which wouldn’t hurt to change too. Its in another of my videos “always forgotten filter” or something like that. Currently away so cant see it myself.

[@omjed360]

I replaced mine a couple of months ago and now it gets really loud when i drive the car for a long time

[@rama567]

because can be different problem and I also have same noise and don't think is fuel pump.....problem can be EVAP system ....somewhere must be valve to adjust pressure in fuel tank and this valve doing this or Evap system.....that's why valve can be broken and fuel pump making more nois because gives more pressure....I'm just checked first part Evap beginning from trottle/going to left fender (there is can of carbon powder) and two hoses goes different ways...somewhere must be 1 or 2 valves

[@las10dedavidroberto14]

Hello. I need to get all 3 parts you show in the video( pump, filter, regulator) for my Mercedes 260E, WDB124026. Any ideas where I can buy them? Thanks

[@MMWA-DAVE]

i bought mine on ebay, genuine bosch from a seller in australia, prestige auto parts. In Australia this is one of my goto places for genuine bosch items at a good price. If outside australia you might have to look more locally for a supplier

[@rama567]

hello, you know maybe in after 1993 in E class m111 (1994) there is also fuel accumulator close to fuel pump ?

[@xhulianomurati5154]

No I think in the m111 the accumulator is in the top of the engine bay

[@topfell8277]

I allways pull off as a assy so I can work on it on the bench

[@MMWA-DAVE]

Good idea

[@Mr1967mejias]

Wish I could add pics. My 15 year old son and I just replaced 2 pumps, filter, accumulator, vent valve, strainer and all hoses yesterday. We’re restoring an ‘89 260E that was given to him. We turned it on 15 minutes after we got home. Sprayed a little gas in the air cleaner and she fired right up. (That was 3 weeks ago.) Installed new custom 17” wheels and tires yesterday, also.

[@wesleyaponte-gonzalez678]

Where did you get your exhaust from may I ask. I need one. Please help

[@MMWA-DAVE]

I have 2 m104's the rear most m104 specific muffler I purchased 1 from FCP euro and 1 from Pelican parts - both eberspacher. The middle mufflers also eberspacher I purchased on eBay in Australia, new old stock using the part number to find them.

[@wesleyaponte-gonzalez678]

Thank you so much. Going to check it out!

[@jorgepenate7915]

I have a doubt, when installing it, the blue cable is the one going to the positive connector of the pump?

[@MMWA-DAVE]

brown is always negative on these MB’s

[@jorgepenate7915]

@@MMWA-DAVE thanks!

[@yigitefezeynepozcanlar8911]

hello i have one problem . when the car wait 1 day stop i can be force the start after 1 start again kess then time start . can you help what iş the start problem

[@gjergjipunmira3942]

you may have a faulty fuel accumulator witch is located at the right side of fuel filter.

[@rama567]

hello, do you know where are valves from Evap system ?or adjust pressure in fuel tank ? first with electromagnet is on left site (driver site/LHD) where coming out from evap can (under left fender)between throttle and can......but where is second ????

[@MMWA-DAVE]

When I had the fuel tank out of my red car - there was only 1 vent line from the tank underneith, its next to the fuel return port it has a plastic valve right under the tank at this connection. Not sure what you are looking for.

[@rama567]

@@MMWA-DAVE hey, I'm already found this...it sits inside under fuel tank, number of part 201 476 01 32

[@shaazy]

Is the air supposed to bleed automatically? My fuel filter and pump were changed by the shop but it is still noisy during operation.

[@MMWA-DAVE]

yes the air should get pushed out of the system on its own. the genuine bosch pumps are almost silent in operation when new, make sure they didn’t put cheap copies in there

[@rfbu]

was it only because it was noisy that you replaced the pump? was any other signs which led you to replace the other items?

[@MMWA-DAVE]

correct. I cant remember what you said your symptoms were but a guy I know in perth with a 300TE wagon was battling with an issue where by his car would randomly stall and immediately restart when slowing down to go around a round about or turn a corner etc. He bypassed the fuel pump relay as a trial and made sure that the pumps were not the issue - the fault continued to occur at random as before. Turns out for him, of all things it was the idle air valve being slow to react. He swapped one off another 300E parts car and the issue is totally resolved. I never would of thought of this, but I guess its quite logical.

[@robertbalogh3663]

Do I need to also replace the accumalator as well? Car was sitting for a quite long time.

[@MMWA-DAVE]

firstly you need to check the condition of the fuel tank before fitting any new parts and have it cleaned or replaced. These things are rusting very badly now. The accumulator can be tested, but i just replace them on principle if original as probably wont last long anyway.

[@archiveselection7656]

I wonder if you can use the same fuel pump for both replacement units?

[@MMWA-DAVE]

the primary and secondary fuel pumps are the same part number, you just order 2 of them.

[@archiveselection7656]

@@MMWA-DAVE Thank you so much for your help. Your Channel is a Blessing. Thank you your all your time and effort. You can be very sure we appreciate your work.

[@MMWA-DAVE]

@@archiveselection7656Thanks, btw, the primary and secondary pumps in this video are a sedan. Some wagons I believe also have 2 pumps but in 2 separate locations. I dont know if those are the same part number. I only know about sedans as I dont own a wagon.

[@kbcarroll]

Is that the cleanest w124 ever or have you replaced some of the exhaust components?

[@MMWA-DAVE]

on both my 124’s i have replaced middle and rear mufflers with oem. Other than that this particular car is original under there.

[@kbcarroll]

@@MMWA-DAVE have you done anything with the original catalytic converters? mine has 236k miles and I'm suspicious my cats are bad.

[@MMWA-DAVE]

@@kbcarroll on both my cars the cats are dead - they arent required to work here in old cars, only when new. It just has to be there. I could gut them for a bit better flow, one of them has broken apart and will be restricting flow.

[@kbcarroll]

@@MMWA-DAVE in my state they are not required. I may have them removed entirely. Not sure if this affects the oxygen sensors

[@MMWA-DAVE]

@@kbcarroll w124’s only have the pre-catalyst o2 sensors so it wont have a clue if they are gone or working or not.

[@Uc9uE3pKsS6uQ]

brand new pumps can be noisy I thing to test it before put on

[@vivipetit1264]

Hi! Is it a good idea to replace both 3 BAR pumps for only one of 6 BAR?

[@MMWA-DAVE]

I cant say for sure, I just like to keep things original and these genuine bosch were a good price for a pair locally surprisingly.

[@parreraz]

Vivi Petit Why does it have 2 pumps?? Why not just one? I have noticed that just some models have 2 pumps,but most have one.Do you know why?

[@21stcenturyozman20]

@@lseguy Only the series II; series I has single pump.

[@Nook_crannylawncaree]

Are both pumps the same size?

[@MMWA-DAVE]

2x identical pumps in series

[@Nook_crannylawncaree]

@@MMWA-DAVE 🙌🏾thx!

[@alanOHALAN]

Does the diesel W124 have the same 3 fuel pumps like this?

[@MMWA-DAVE]

This is 2 fuel pumps, a filter and pressure accumulator. Not sure what the diesel has, never worked on one. Assumed it was mechanical pump in the engine bay.

[@alanOHALAN]

@@MMWA-DAVE yeah it is, my car stalls at redlight, should i change the lift pump?

[@justlookingfortruth181]

Is there 2 pumps?

[@MMWA-DAVE]

depending on the year i think. Both mine do

[@zekmek7891]

Hi, which engine?

[@MMWA-DAVE]

M104.980 Note, since making this video, these new pumps failed by leaking fuel out of the crimped end and have been replaced again after 6 years, 5000KM. Genuine Bosch again.

[@indotube8125]

Is it original mercedes fuel pump ??

[@MMWA-DAVE]

it was- it is now replaced with new bosch pumps, which are the OEM.

[@ebutuoyebutouy]

Ok. So how long the new pump going to last? Lol.

[@MMWA-DAVE]

probably 6 month the way things are going these days

[@ebutuoyebutouy]

@@MMWA-DAVE Just wanted to leave a lighthearted comment. Then wondered. Glad I did not offend you. I have to replace two. In my 86 190e-16 and another in my 190e 2.6. So the jokes also on me. Stay safe.