mskembo

I don't see why that would be necessary in this case. You are going to disconnect it while the pump is still down in the tank, and then re-connect it after the new one is put into the tank. I don't see what the danger factor would be.

LILBENZ230

You should disconnect the battery. If you follow the instructions in the manual without any variation, will you really fry a SAM?

Glyn M Ruck

John - The SAMs on your car are a lot more robust than early ones. I'll put money on the fact that the dealer would not bother to disconnect the battery but you are playing around with fuel vapour all over the place & really don't want a spark. Disconnect the battery & have a fire extinguisher close at hand - please!. You could still have some charged caps in the system. Keep ignition off & keys in your pocket. You have not had much luck lately. You have a Star if you have any post disconnection synch problems.

johnand

Sound advice Glyn. Better to chance losing a SAM than blowing my *** up

mskembo

Yeah, listen to Glyn instead of me... I didn't even think about vapor+spark, or factor in your current luck status!

Glyn M Ruck

Coming from the industry I'm not the most careful person myself. A case of familiarity breeds contempt. All you need is the correct AF ratio and a spark & the whole fuel tank will go up because you have it open from inside the car.

johnand

Fuel filter before the pump my *** Look at the pics of the new pump:





So, it appears the change to the late W203 and W204 that eliminated the fuel filter, did NOT in fact change it to before the pump. The pump just clearly has a standard sock filter that almost all in-tank pumps have. So, the late 203 and 204's essentially are running on unfiltered fuel. Obviously another BS cost cutting measure.

I am going to investigate adding an inline filter somehow.

LILBENZ230

Does it really hurt? I mean if all of them are running it that way is there harm to be done?

Glyn M Ruck

Dirt is the killer of FI systems. John - Is there any way you can retrofit the old filter. I guess you don't have all the piping. Is the mounting point still there?

Cheap *******s - Anyway - the pump still ingests dirt as the old ones did other than the nut & bolt catcher.

Presume they have not installed an inline filter up front??? I think you said it was no longer a service item.

pcy

I thought the fuel pump is on one side and the fuel filter is on the other side. John, would you please look in the other cavity, I am thinking the fuel filter is in the other cavity.

Glyn M Ruck

Yeah? I don't know on the new ones.

mskembo

I must be a very dull crayon, because I had to go back and read this. I thought you were suprised that there was not a pre-pump and post pump filter. Now it sounds like you don't have one at all! Are you saying that not only is there no fuel filter built into the pump, but you don't have an inline fuel filter either? If that's the case I think I'd be calling and yelling at MBUSA (even if just to get it off my chest)

d1no

Hey John did you get a chance to put the new pump in there? Im eager to see if this fixes your problem

johnand

Yes, read Glyn's post. Dirt is a huge killer of FI systems.

Glyn, the mounting point is there, but all the fuel lines are routed differently and tucked on top of the tank:



When I went to replace the filter initially, I followed the lines all the way up front, but found no filter. I was told by the lead tech at the dealer, that it was BEFORE the pump and no longer a service item.

I will take a look, but not holding my breath. I have to go get another seal at the dealer before taking the driver's side apart.

It appears at this point the 07's have no filter unless it is in the driver's side sending unit assembly.

No, I plan to tackle it on Saturday morning.

Considering the 07 C230 is a flex fuel vehicle, I find it completely asinine that they didn't have a regularly serviced stainless steel inline filter. I will be finding a way to retrofit one. May even install a filter/water separator.

Glyn M Ruck

I'm really hoping you find a filter on the drivers side - I'm becoming less optimistic. What the hell were they thinking!

Maybe the bolt catcher is more efficient than we think but I doubt it. The reason the filter has always been after the pump is that it can't live with restriction on the suction side without cavitating at large demand.

WaveyKat

My Fuel Pump Died Last Night pump Cost at the Dealer $358 + 140 Labor:-(. i have C320 this should be an Easy DIY job Correct? because am getting the pump online for $246.

splinter

The filter is likely an integral part of the “Delivery Unit w/ Fluid Level Sensor,” opposite the pump.

PN 209 470 13 94??




photo credit BrianS

Glyn M Ruck

Hah! splinter - Indeed I hope you are correct - I see this is for M113/C55. Man I hope it's the same for newer M272's - This would make sense.

In the words of Henry Higgings - Shaw's Pygmalion - "By George She's Got It!"

I hope

If this is the case - dealer has it wrong again!

johnand

Nice find Splinter! The part number for the delivery unit on my car is 2094700994. I bet they are essentially the same, or maybe a revised part.

I will crack the other side to verify.

LILBENZ230

Here's to hoping your C230 lives again today!

johnand

She's ALIVE!

Fuel pump replacement complete. I had just under half a tank and the fuel was 1/4" from the top of the tank ring Good I guess in some ways, less vapor, but had to deal with all the fuel disconnecting and connecting everything. Also, the new seal was very different from the original and creates a much larger gap for the clamp ring, and I already have tightened it more than 8 Nm. This is the new 0199972345 seal, and my orginal 0169974145 was superseded. I did not use any lubricating paste like is called out in WIS part number 0009890160, as I missed that before and didn't have any on hand. I will stop by the dealer on Monday, grab some paste, and a 1/4" torque wrench. My 3/8" one won't fit in there. I will pull the clamp off lubricate the seal, and re-torque the clamp.

Here is a pic of the gap:

LILBENZ230

Great news! I know you have missed driving the C!

Glyn M Ruck

Good news indeed!! - guess you did not have time to check for filter on the other side? splinter's post above gives me hope.

johnand

Glyn, no need. John was correct and the filter is integrated with the sender on the drivers side. Read "fuel pump replacement" PDF in my post here: https://mbworld.org/forums/4225302-post1.html

I should have read that closer before, but it states it is in the fuel tank sender. The real question, I have yet to find the answer to, is how often it needs to be changed. No real consensus from anyone at MB

Glyn M Ruck

I guess it is on the other side

https://mbworld.org/forums/attachmen...uel-filter.pdf