Fuel Pump Failure?
Junior Member
Joined: Jun 2010
Posts: 25
Likes: 5
From: Taipei, Taiwan
CLK63 AMG Black Series, Ducati MH900E, Ducati 996S,Ducati Streetfighter S, Honda X11, BMW C600 Sport
Just to update everyone, I got a 2nd opinion and ended up replacing the fuel pump altogether, and the problem has gone away. The car is running stronger than before so I wonder if the intermittent failure did have some effect (Or maybe it's all in my head). Anyway, problem solved!
Andyy - Glad to hear that you were able to just change the filter, I was told that some owners did the same and the light came back on, and ended up having to replace the pump at the end. Hopefully yours fare better! Good luck.
Andyy - Glad to hear that you were able to just change the filter, I was told that some owners did the same and the light came back on, and ended up having to replace the pump at the end. Hopefully yours fare better! Good luck.
In my case, the P0191 error code happened again about 2-3 months after I changed a new fuel filter. This time I have my fuel pump changed. Thank God that my fuel pump wasn't fixed within the fuel tank and can be changed alone. Now I had my fuel pump changed for about 1 month and currently everything is fine.
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Joined: Mar 2003
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From: South Florida
ML350
bringing this back up......CEL came on with same codes.....0191 and 3699......the fuel pump was just changed prior to me buying it so now will try to track down the cause. Car is running fine.
Junior Member
Joined: Jun 2010
Posts: 25
Likes: 5
From: Taipei, Taiwan
CLK63 AMG Black Series, Ducati MH900E, Ducati 996S,Ducati Streetfighter S, Honda X11, BMW C600 Sport
The second fuel pump change also worked, however after less than 2 years the code0191 showed up even again!
That's when I suspected there might be some deposit or contamination in my fuel tank or fuel system.
Instead of change a fuel pump again which is quite expensive, I simply added some fuel system cleaner/fuel injector cleaner into the tank right before refuel when the tank is almost empty,
and magically the P0191 didn't show up again after I simply erased the error code with my iPhone and OBD2 adaptor.
Hope this also works on your car!
Junior Member
Joined: Aug 2010
Posts: 73
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From: Northeast
CLK63BS
I had the same thing happen to my CLK63BS this past spring, and I did the same thing (couple of bottles of fuel system cleaner). The code went away and hasn't come back (and I'm still on the original fuel pumps with 93k'ish miles).
Personally I also had the code0191 popped up again about 1-2 years after I changed the fuel pump for the first time.
The second fuel pump change also worked, however after less than 2 years the code0191 showed up even again!
That's when I suspected there might be some deposit or contamination in my fuel tank or fuel system.
Instead of change a fuel pump again which is quite expensive, I simply added some fuel system cleaner/fuel injector cleaner into the tank right before refuel when the tank is almost empty,
and magically the P0191 didn't show up again after I simply erased the error code with my iPhone and OBD2 adaptor.
Hope this also works on your car!
The second fuel pump change also worked, however after less than 2 years the code0191 showed up even again!
That's when I suspected there might be some deposit or contamination in my fuel tank or fuel system.
Instead of change a fuel pump again which is quite expensive, I simply added some fuel system cleaner/fuel injector cleaner into the tank right before refuel when the tank is almost empty,
and magically the P0191 didn't show up again after I simply erased the error code with my iPhone and OBD2 adaptor.
Hope this also works on your car!
Junior Member
Joined: Jun 2010
Posts: 25
Likes: 5
From: Taipei, Taiwan
CLK63 AMG Black Series, Ducati MH900E, Ducati 996S,Ducati Streetfighter S, Honda X11, BMW C600 Sport
Of course I think Keropur from Mercedes themselves is a good choice too.
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From: Boca Raton, FL
GT3RS
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From: South Florida
ML350
they just called and want to change the fuel pump again under warranty with no charge to me. Verbally he said it was a high voltage from the fuel pump which doesnt match the codes the other shop found. The advisor couldnt explain it very well so he kept saying the shop foreman was qualified with AMG cars and that is what he said. Ill be going by in person. Im skeptical.
Last edited by Doctodd33; Jan 13, 2020 at 03:44 PM.
MBWorld Fanatic!
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From: South Florida
ML350
I just went by spoke with the tech himself. He says that it’s an amperage error where the fuel pump needs more power because the fuel pump is bad. He thinks that these parts are old because they’re not used very often so it’s just a repetitive error that he has seen frequently. So this part of the diagnostic work up is to get a new fuel pump and see if it will fail on demand.
Junior Member
Joined: Aug 2010
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From: Northeast
CLK63BS
I've used Chevron Techron (not that is is necessarily better than anything else).
We'll see what happens in the spring. I wouldn't be surprised if I eventually have to replace the fuel pump(s), but it definitely cleared up the issue for the last several months.
We'll see what happens in the spring. I wouldn't be surprised if I eventually have to replace the fuel pump(s), but it definitely cleared up the issue for the last several months.
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Joined: Mar 2003
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From: South Florida
ML350
So they changed the fuel pump for no cost because there’s two year warranty on parts and labor on the parts, and I took the car home today. And the check engine light came on on the way home. Chevron Techron is next
Junior Member
Joined: Jul 2018
Posts: 43
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From: Boca Raton, FL
GT3RS
Holy crap. Thanks for the update. Please keep us posted and fingers crossed. Will be amazing if the Techron clears the code.
No CEL (yet) on mine but after recently joining this thread I put in Chevron Techron last time I filled up. I'm 1/2 way through the tank and will add a 2nd Techron next time I fill up.
No CEL (yet) on mine but after recently joining this thread I put in Chevron Techron last time I filled up. I'm 1/2 way through the tank and will add a 2nd Techron next time I fill up.
Member
Joined: May 2015
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CLKBS
I've used Lucas Oil in my e30 but never anything in the CLKBS.
Good luck.
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Joined: Mar 2003
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From: South Florida
ML350
The fuel pump was just changed in September. My dealership told me there’s a two year warranty on parts and labor installing those parts. There was no warranty on the car itself.
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From: South Florida
ML350
Couple weeks ago I put some Chevron techron in the tank right before a fill up, and then drove to the keys and back almost using the entire tank. CEL was still on as of yesterday. Drove it today with 1/4 tank left and the CEL is no longer on. Car feels a bit peppier too.
Member
Joined: May 2015
Posts: 158
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CLKBS
Couple weeks ago I put some Chevron techron in the tank right before a fill up, and then drove to the keys and back almost using the entire tank. CEL was still on as of yesterday. Drove it today with 1/4 tank left and the CEL is no longer on. Car feels a bit peppier too.
Thanks for the update.
Last edited by Derekm15; Oct 3, 2020 at 12:35 AM.
Member
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CLKBS
Junior Member
Joined: Jun 2010
Posts: 25
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From: Taipei, Taiwan
CLK63 AMG Black Series, Ducati MH900E, Ducati 996S,Ducati Streetfighter S, Honda X11, BMW C600 Sport
So far as I know, the CLKBS fuel filter is integrated into the fuel pump, which doesn't have an independent part number and can't be solely acquired.
$750 is somehow too expensive for only a filter so I suppose you might changed the fuel pump as well?
Also if anyone know how to get the filter alone I'm very interested to know.
MBWorld Fanatic!
Joined: Mar 2003
Posts: 2,017
Likes: 148
From: South Florida
ML350
Hi,
So far as I know, the CLKBS fuel filter is integrated into the fuel pump, which doesn't have an independent part number and can't be solely acquired.
https://www.youtube.com/watch?v=OXpRL9NGUrI&t=108s
The link is the fuel filter/pump of another M156 vehicle, which is identical to my own fuel pump/filter on my CLKBS.
$750 is somehow too expensive for only a filter so I suppose you might changed the fuel pump as well?
Also if anyone know how to get the filter alone I'm very interested to know.
So far as I know, the CLKBS fuel filter is integrated into the fuel pump, which doesn't have an independent part number and can't be solely acquired.
https://www.youtube.com/watch?v=OXpRL9NGUrI&t=108s
The link is the fuel filter/pump of another M156 vehicle, which is identical to my own fuel pump/filter on my CLKBS.
$750 is somehow too expensive for only a filter so I suppose you might changed the fuel pump as well?
Also if anyone know how to get the filter alone I'm very interested to know.
Junior Member
Joined: Jun 2010
Posts: 25
Likes: 5
From: Taipei, Taiwan
CLK63 AMG Black Series, Ducati MH900E, Ducati 996S,Ducati Streetfighter S, Honda X11, BMW C600 Sport
On the video start from 1:10, we can see the filter part is still detachable and changable.
IMHO if we can manage to find a filter of the exact same size, we can change it with a much lower price compared with the fuel pump assembly.
IMHO if we can manage to find a filter of the exact same size, we can change it with a much lower price compared with the fuel pump assembly.
