c270cdi turbo deisel 2001

[beau01]

hi can anyone tell me if the 2 lift pumps under the back seats are to be working? as i seems to be not getting any deisel into filter and one side of tank is full and the other is empty

 

[television]

Hello and welcome, I do not think that there are any lift pumps under the rear seat, wait till someone else comes on that knows these cars

http://www.detali.ru/cat/oem_mb1.as...722.640&GM=716.648716.649&CT=F&Cat=69J&SID=47

 

[Cole@MBS]

hi can anyone tell me if the 2 lift pumps under the back seats are to be working? as i seems to be not getting any deisel into filter and one side of tank is full and the other is empty

You have a primer pump on the o/s which pumps the fuel up to the high pressure, the high pressure pump then returns the unused fuel back to the n/s pot, the n/s has a level sensor as does the o/s to keep track of the levels,last time i see that fault it was the h/pressure pump, there's also a modified pipe which comes with the pump!

 

[beau01]

hi i have been told that i need to new lift pumps in tank as thay have no power to them ?

 

[Cole@MBS]

hi i have been told that i need to new lift pumps in tank as thay have no power to them ?

If theres no power to them, i would say check the 5 pin bottom plug coming out the rear Sam, your probley find that the plugs melted due to the pump burnt out!

 

[HelpThisDude]

Sam, I tried to get diesel to flow out of the fuel filter inlet pipe. With the ignition on, there was no fuel coming out of this pipe. Would this be caused by the lift pump?

 

[Cole@MBS]

If theres no power to them, i would say check the 5 pin bottom plug coming out the rear Sam, your probley find that the plugs melted due to the pump burnt out!

read the above fault, the answers are there!

 

[HelpThisDude]

Silly me, sorry SAM.....

 

[MB TECH WARRINGTON]

Silly me, sorry SAM.....

there are no electric pumps in the tank, there is a sender on one side which shifts fuel from one side to another,
this works off return pressure created by the high pressure pump, if your tank is just filling up on one side, in my experience, 8 out of 10 high pressure pump fault

there is a low pressure pump which primes to high pressure pump, the fuel senders in the tank work completely on return pressure if im not mistaken.


im 95% certain a high pressure pump should cure fault, hope you get it sorted, very easy job, euro car parts do recon bosch pumps

 

[HelpThisDude]

MB Tech, thank you for your reply. Would you be able to tell me if a failed H/P pump would cause a rough/hunting idle?
What faults would a failed pump cause?
Cheers

 

[Cole@MBS]

there are no electric pumps in the tank, there is a sender on one side which shifts fuel from one side to another,
this works off return pressure created by the high pressure pump, if your tank is just filling up on one side, in my experience, 8 out of 10 high pressure pump fault

there is a low pressure pump which primes to high pressure pump, the fuel senders in the tank work completely on return pressure if im not mistaken.


im 95% certain a high pressure pump should cure fault, hope you get it sorted, very easy job, euro car parts do recon bosch pumps

Pump on the o/s of the tank as in the link, item 110
http://www.detali.ru/cat/oem_mb2.as...648716.649&CT=F&cat=69J&SID=47&SGR=015&SGN=01

 

[MB TECH WARRINGTON]

Pump on the o/s of the tank as in the link, item 110
http://www.detali.ru/cat/oem_mb2.as...648716.649&CT=F&cat=69J&SID=47&SGR=015&SGN=01

this pump item 110 works off return pressure does it not, the electric connectors are for level sensors etc,

if the high pressure pump is faulty this sender will not work correctly, thus leaving the other side of tank, where pick up is bone dry.

this cdi system does not use an electric pump, i may be mistaken,


but im convinced a high pressure pump will fix your problem, and yes a faulty pump can and will cause rough running, try putting 20l of diesel in your car,(the diesel will itself fill the otherside of tank where pick up is) run it, bet it runs unitil near half a tank, seen this problem many times

 

[Cole@MBS]

this pump item 110 works off return pressure does it not, the electric connectors are for level sensors etc,

if the high pressure pump is faulty this sender will not work correctly, thus leaving the other side of tank, where pick up is bone dry.

this cdi system does not use an electric pump, i may be mistaken,


but im convinced a high pressure pump will fix your problem, and yes a faulty pump can and will cause rough running, try putting 20l of diesel in your car,(the diesel will itself fill the otherside of tank where pick up is) run it, bet it runs unitil near half a tank, seen this problem many times

MB tech, im not working to put you down,just to help this chap!!, all cdis have this pre-delivery pump, as my first rely, i agree that the fault is with-in the high pressure pump, wasnt trying to dout your word but just stating how the system works,the fault is in the high pressure pump, thats 2 experts who agree!!

 

[MB TECH WARRINGTON]

MB tech, im not working to put you down,just to help this chap!!, all cdis have this pre-delivery pump, as my first rely, i agree that the fault is with-in the high pressure pump, wasnt trying to dout your word but just stating how the system works,the fault is in the high pressure pump, thats 2 experts who agree!!

i didnt think you were pal,
i was genuinely thinking that the pump 110 in the tank worked solely off return pressure, ie no electric pump, i was just asking, as this is how i remembered it from my cdi courses.

ie pump 110 works from return pressure from high pressure pump,
this then puts fuel into ns of tank, where the pick up is, the low pressure pump picks fuel from this side, which primes the high pressure pump,


this was how i thought it all worked thats all, its good to throw thoughts to other parties then recieve back, one things for sure you can never have enough knowledge of the cars and other experts input is welcomed, this is one of the main reasons i joined this forum to not only help others but also help myself,

thanks mate, mb tech

 

[BlackC55]

Just to add.

The early CDI's did not have pumps in the tank but the later cars do.

If you look at the fuel filter and it had two metal pipes coming (at right angle) out of it it means that it has a pump in the tank.

When you turn the ignition on you can see the pipes move as the pump is primed.

 

[exupmonkey]

This thread has answered the problem I have with my 03 c220 CDI, only using half the tank etc, thanks guys. Looks like a high pressure pump is on my shopping list. One question I have is how easy is it to replace the pump...is it a jack-it-up, tank-off scenario?

Oh, first post by the way, so hi to all.

 

[Cole@MBS]

I belive i put this link on your thread today, pump is on the front of the engine held in with 3 torx bolts, easy to replace, will see if i can find the correct link!

 

[Cole@MBS]

Heres the link

http://www.detali.ru/cat/oem_mb2.as...647716.651&CT=M&cat=19U&SID=07&SGR=013&SGN=01

 

[exupmonkey]

Thats great mate, thanks.

 

[exupmonkey]

I belive i put this link on your thread today, pump is on the front of the engine held in with 3 torx bolts, easy to replace, will see if i can find the correct link!

Well, opened up the front bit where all the oily stuff is found thinking a spanner wielding novice like myself could tackle this job....I was wrong! So many pipes, pulleys and belts, I couldn't even find the ****** thing