Great minds............!
Fuel pump help needed
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Well - good news all round!! When you have some time I would be interested in why the pump failed. They have always been crimped so you have to destroy them to check.
MBWorld Fanatic!
Joined: Mar 2004
Posts: 1,175
Likes: 24
From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
glad to hear your car is running again. I guess you'll be sending the car to the body shop. With this fuel pump ordeal, we almost forgot about your stint with the armored truck :-)
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Super Moderator
Joined: Jul 2006
Posts: 3,365
Likes: 12
From: Orange County, CA
GMC - Miata - Trek - P-Car
Good to hear, johnand.
Was compelled to replace both sides on mine last year -what with the now-necessary retrofitting of AMG’s superseded hardware- to the tune of ~$1000.
At least its external filter swap is an easy 15-minute/$50 task. ;)
It is perplexing why johnand’s pump failed so soon. Although both of ours had traversed similar mileage before giving up the ghost, mine undoubtedly pressurized substantially more fuel to the injectors -given its ~18-mpg lifetime average- and been subjected to escalated on/off city drive cycles by virtue its typical operational dictates and age. Note California’s CARB-mandated gasoline blend also ostensibly contains up to 10% ethyl alcohol per LCFS edict.
Found scant little debris on its intake screen during forensic investigation. It did keep wayward refinery/filling station rust, macadam and bird droppings from the impellers, though.
The trusty DVM proved its internal armature wiring had failed.
Was compelled to replace both sides on mine last year -what with the now-necessary retrofitting of AMG’s superseded hardware- to the tune of ~$1000.
At least its external filter swap is an easy 15-minute/$50 task. ;)
Found scant little debris on its intake screen during forensic investigation. It did keep wayward refinery/filling station rust, macadam and bird droppings from the impellers, though.
The trusty DVM proved its internal armature wiring had failed.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Interesting splinter - sounds as though the design of your pump is/was different to the Bosch articles that I have prised open. The ones I have opened had seized from dirt.
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
Likes: 64
From: Camas, WA
2007 C230SS; 2014 ML350 BT
John,
Did you use the lubricating paste that was called out in the WIS document? That stuff lists for $89.00
Not sure if I should even bother messing with it now.
Will test/dismantle the pump when I get a chance.
So you had to convert to the C55 pump and filter integrated into the sender?
I was looking at my spreadsheet and the car ran 3597 gallons of fuel through the pump until it's demise, and 1495 of it was E85.
Did you use the lubricating paste that was called out in the WIS document? That stuff lists for $89.00
Not sure if I should even bother messing with it now.Will test/dismantle the pump when I get a chance.
So you had to convert to the C55 pump and filter integrated into the sender?
I was looking at my spreadsheet and the car ran 3597 gallons of fuel through the pump until it's demise, and 1495 of it was E85.
Good to hear, johnand.
Was compelled to replace both sides on mine last year -what with the now-necessary retrofitting of AMG’s superseded hardware- to the tune of ~$1000.
At least its external filter swap is an easy 15-minute/$50 task.
It is perplexing why johnand’s pump failed so soon. Although both of ours had traversed similar mileage before giving up the ghost, mine undoubtedly pressurized substantially more fuel to the injectors -given its ~18-mpg lifetime average- and been subjected to escalated on/off city drive cycles by virtue its typical operational dictates and age. Note California’s CARB-mandated gasoline blend also ostensibly contains up to 10% ethyl alcohol per LCFS edict.
Found scant little debris on its intake screen during forensic investigation. It did keep wayward refinery/filling station rust, macadam and bird droppings from the impellers, though.
The trusty DVM proved its internal armature wiring had failed.
Was compelled to replace both sides on mine last year -what with the now-necessary retrofitting of AMG’s superseded hardware- to the tune of ~$1000.
At least its external filter swap is an easy 15-minute/$50 task.
It is perplexing why johnand’s pump failed so soon. Although both of ours had traversed similar mileage before giving up the ghost, mine undoubtedly pressurized substantially more fuel to the injectors -given its ~18-mpg lifetime average- and been subjected to escalated on/off city drive cycles by virtue its typical operational dictates and age. Note California’s CARB-mandated gasoline blend also ostensibly contains up to 10% ethyl alcohol per LCFS edict.
Found scant little debris on its intake screen during forensic investigation. It did keep wayward refinery/filling station rust, macadam and bird droppings from the impellers, though.
The trusty DVM proved its internal armature wiring had failed.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
John - I presume all this paste does is allow the clamping device etc. to slip on the seal & not stretch it at any one spot??? Any microfine wax containing product that will not swell the elastomer will do that. Petroleum jelly being a good example!
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
Likes: 64
From: Camas, WA
2007 C230SS; 2014 ML350 BT
Just drove the car this morning, and am dumbfounded how much better it runs. I have been plagued by a hesitation problem for months now, and the idle has gotten a tad rough at times to. The hesitation is now completely gone, and the idle is butter smooth. In fact, the idle is so smooth now, I have to do a double take, as I keep thinking the engine died.
I did completely clean the MAF, air duct, TB, and filter box, and put new filters in, so that could be part of it. But, I am very pleased with the outcome regardless of how I got it.
Now, just have to reschedule my body shop appointment and get that taken care of. Just don't want to give the car up, since I just got it back
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I'm delighted for you. If you can smell no fumes - leave well alone. I think you have been suffering sub par fuel pressure for a while. To me it always makes our V6 engines feel hesitant & gritty.
Super Moderator
Joined: Jul 2006
Posts: 3,365
Likes: 12
From: Orange County, CA
GMC - Miata - Trek - P-Car
John,
Did you use the lubricating paste that was called out in the WIS document? That stuff lists for $89.00 Not sure if I should even bother messing with it now.
Will test/dismantle the pump when I get a chance.
So you had to convert to the C55 pump and filter integrated into the sender?
I was looking at my spreadsheet and the car ran 3597 gallons of fuel through the pump until it's demise, and 1495 of it was E85.
Did you use the lubricating paste that was called out in the WIS document? That stuff lists for $89.00
Not sure if I should even bother messing with it now.Will test/dismantle the pump when I get a chance.
So you had to convert to the C55 pump and filter integrated into the sender?
I was looking at my spreadsheet and the car ran 3597 gallons of fuel through the pump until it's demise, and 1495 of it was E85.
Was compelled to replace both sides owing to age and a revised 5-pin harness incompatibly. Silly 203 470 34 94 pump has a MSRP of $1300.
It’s quite effective, though, as it’ll empty a full tank when subjected to ~100 miles of track day frivolities.
Still utilizes an inexpensive Mahle-Knecht external filter.
MBWorld Fanatic!
Joined: Jan 2006
Posts: 3,212
Likes: 8
From: Pasadena, CA
2002 C230K, 2013 BMW 328, 2015 BMW X5
Used a dollop of assembly lubricant. They're still leak-free.
Was compelled to replace both sides owing to age and a revised 5-pin harness incompatibly. Silly 203 470 34 94 pump has a MSRP of $1300.
It’s quite effective, though, as it’ll empty a full tank when subjected to ~100 miles of track day frivolities.
Still utilizes an inexpensive Mahle-Knecht external filter.
Was compelled to replace both sides owing to age and a revised 5-pin harness incompatibly. Silly 203 470 34 94 pump has a MSRP of $1300.
It’s quite effective, though, as it’ll empty a full tank when subjected to ~100 miles of track day frivolities.
Still utilizes an inexpensive Mahle-Knecht external filter.
Splinter, were you coming from a four pin to a five pin change? What is the extra wire. The four pins are the hot and ground and then the two resistance/sending wires of the float level.
Still haven't done my redo of my fuel pump do to moving duties, but may try tonight.
Ed
Super Moderator
Joined: Jul 2006
Posts: 3,365
Likes: 12
From: Orange County, CA
GMC - Miata - Trek - P-Car
John, sorry to ask Splinter a ? here.
Splinter, were you coming from a four pin to a five pin change? What is the extra wire. The four pins are the hot and ground and then the two resistance/sending wires of the float level.
Still haven't done my redo of my fuel pump do to moving duties, but may try tonight.
Ed
Splinter, were you coming from a four pin to a five pin change? What is the extra wire. The four pins are the hot and ground and then the two resistance/sending wires of the float level.
Still haven't done my redo of my fuel pump do to moving duties, but may try tonight.
Ed
legend:
X36/3 connector
M3 pump
B4/1 LH fuel level sensor
B4/2 RH fuel level sensor
Good luck with yours.
Super Member
Joined: Mar 2007
Posts: 812
Likes: 0
From: centennial, CO
2003 c240
Hey guys, looks like my luck has come to an end with my car and i will soon be needing to replace my fuel pump also. Is it possible for you to post the WIS for the job? I want to make sure that I buy everything required before I take everything apart. Also, is there anything I should be careful of before pulling the pump out? What brand of pump should I go with? Thanks in advance.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Hey guys, looks like my luck has come to an end with my car and i will soon be needing to replace my fuel pump also. Is it possible for you to post the WIS for the job? I want to make sure that I buy everything required before I take everything apart. Also, is there anything I should be careful of before pulling the pump out? What brand of pump should I go with? Thanks in advance.
https://mbworld.org/forums/attachmen...-fuel-pump.pdf
Super Member
Joined: Mar 2007
Posts: 812
Likes: 0
From: centennial, CO
2003 c240
I am trying to determine which fuel pump I need and i am seeing two different part numbers. Can someone verify which one I need to purchase for a 2003 c240?
Here are the two part numbers:
203-470-23-94
203-470-35-94
Here are the two part numbers:
203-470-23-94
203-470-35-94
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
Likes: 64
From: Camas, WA
2007 C230SS; 2014 ML350 BT
PM me your VIN, and I'll look it up for you. If one is superceded, it will tell you the new number under the old.
Super Member
Joined: Mar 2007
Posts: 812
Likes: 0
From: centennial, CO
2003 c240
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
Likes: 64
From: Camas, WA
2007 C230SS; 2014 ML350 BT
The A2034702394 is the current part number for the "Delivery Unit" for you car. I would suggest a new "Seal Ring" too. Part# is A2114710579. Geez, that seal ring has been revised 3 times.
